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# Cooling Load Guide: AC Size, BTU Charts & Cooling Load Calculations

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## Posts
- [Thermostat Calls for Heat but Furnace Does Not Respond](https://coolingloadguide.com/thermostat-calls-heat-furnace-not-responding/): Trace a thermostat heat call through delays, doors, safeties, low-voltage wiring and the furnace sequence without bypassing combustion or rollout controls.
- [Mini-Split Refrigerant Diagnosis: What Measurements Can Prove](https://coolingloadguide.com/mini-split-refrigerant-diagnosis/): Understand mini-split refrigerant diagnosis using model data, operating mode, temperatures, weighed charge and leak testing—not universal pressure targets.
- [Thermostat Calls for Cooling but Outdoor Unit Does Not Start](https://coolingloadguide.com/thermostat-calls-cooling-outdoor-unit-not-starting/): Trace a thermostat cooling call through compressor delay, float switches, control wiring, contactor command and power while keeping live-voltage work.
- [Mini-Split Humidity Control: Runtime, Airflow, and Zone Load](https://coolingloadguide.com/mini-split-humidity-control/): Evaluate mini-split humidity control through sensible and latent load, minimum capacity, fan behavior, infiltration and measured dew point rather than setpoint.
- [Duct Leakage Testing vs Air Balancing: Different Answers](https://coolingloadguide.com/duct-leakage-testing-vs-air-balancing/): Compare duct leakage testing with air balancing, including what each measurement proves, why one cannot replace the other and when a project needs both.
- [One Mini-Split Outdoor Unit With Multiple Heads: How Capacity Is Shared](https://coolingloadguide.com/one-mini-split-outdoor-unit-multiple-heads/): Learn how one mini-split condenser shares capacity among multiple heads, handles mode calls and changes performance as zone demand and combinations vary.
- [How to Read a Residential Duct Leakage Test Report](https://coolingloadguide.com/read-duct-leakage-test-report/): Read a duct leakage report by checking CFM25, pressure, normalization, test boundary, acceptance authority and compatible before-and-after results.
- [Low-Voltage Thermostat Faults: Shorts, Opens, and Voltage Drop](https://coolingloadguide.com/low-voltage-thermostat-faults/): Trace low-voltage thermostat faults by separating open circuits, shorts, voltage drop, transformer loading and safety switches without bypassing controls.
- [Before-and-After Duct Sealing Tests: Proving the Repair](https://coolingloadguide.com/before-after-duct-sealing-test/): Learn how to compare duct leakage before and after sealing, including matching test boundaries, conditions and the extra checks needed to verify comfort.
- [Thermostat Calibration: How to Compare and Correct Temperature](https://coolingloadguide.com/thermostat-temperature-calibration/): Check thermostat calibration with a stable reference, sensor placement, display rounding and allowed offsets before blaming HVAC capacity or changing controls.
- [Mini-Split Defrost Cycle: Normal Behavior and Warning Signs](https://coolingloadguide.com/mini-split-defrost-cycle-behavior/): Understand mini-split defrost timing, indoor comfort changes and outdoor-unit signs that separate normal frost clearing from drainage, sensor or airflow faults.
- [Zoning Dampers and Static Pressure: What Happens as Zones Close](https://coolingloadguide.com/zoning-dampers-static-pressure/): Learn how closing zoning dampers changes system airflow and static pressure, why bypass is not universal and which measurements protect equipment and comfort.
- [Mini-Split Heating Capacity in Cold Weather: Reading the Data](https://coolingloadguide.com/mini-split-cold-weather-heating-capacity/): Read mini-split cold-weather heating capacity by separating rated and maximum output, design temperature, defrost effects, room load and backup needs.
- [When Should You Get a Residential Duct Leakage Test?](https://coolingloadguide.com/when-to-get-duct-leakage-test/): See when duct leakage testing is useful after construction, comfort complaints, sealing or replacement—and when airflow or load testing is the better choice.
- [Low-Ambient Mini-Split Cooling: Limits, Controls, and Loads](https://coolingloadguide.com/low-ambient-mini-split-cooling/): Evaluate mini-split cooling in cold outdoor weather by checking model operating limits, low room load, controls, drainage and required manufacturer accessories.
- [How Duct Leakage Reduces Delivered Cooling to Rooms](https://coolingloadguide.com/duct-leakage-delivered-cooling/): Learn how supply and return leakage can reduce cooling delivered to rooms, why temperature alone is incomplete and which measurements quantify the loss.
- [Thermostat Setpoint Limits and Keypad Lock: What Each Restricts](https://coolingloadguide.com/thermostat-setpoint-limits-keypad-lock/): Learn how thermostat keypad locks, heating and cooling setpoint limits, user permissions and cloud controls differ—and how to verify the active restriction.
- [Crawlspace Duct Leakage: Testing Moisture and Air Paths](https://coolingloadguide.com/crawlspace-duct-leakage-testing/): See how crawlspace duct leakage tests separate supply loss from return air entry, and why moisture, soil gases and crawlspace boundaries affect diagnosis.
- [Thermostat Fan Control: G Terminal vs Equipment-Controlled Blower](https://coolingloadguide.com/thermostat-fan-control-g-terminal/): Understand thermostat G-terminal fan calls, equipment-controlled heating airflow, relay behavior and why a running or stopped blower needs circuit-specific.
- [Mini-Split Airflow and Louver Position: Fixing Poor Room Coverage](https://coolingloadguide.com/mini-split-airflow-louver-position/): Improve mini-split room coverage by checking fan speed, vane direction, intake clearance and air mixing without treating louver position as a capacity fix.
- [Heat-Pump Thermostat O/B Setting: Reversing-Valve Logic](https://coolingloadguide.com/heat-pump-thermostat-ob-setting/): Set heat-pump O/B reversing-valve logic from manufacturer data, then distinguish a configuration error from valve, wiring and refrigeration faults safely.
- [Mini-Split Line Length and Additional Refrigerant Charge](https://coolingloadguide.com/mini-split-line-length-additional-charge/): Check mini-split line-length limits, factory-charge coverage, added refrigerant and elevation rules using exact model installation data and weighed records.
- [Attic Duct Leakage: Separating Air Loss From Heat Gain](https://coolingloadguide.com/attic-duct-leakage-testing/): Learn how attic duct leakage differs from insulation heat gain, which tests identify each problem and why cold register air does not prove intact delivery.
- [Mini-Split Condensate Drain Problems: Leaks, Pumps, and Slope](https://coolingloadguide.com/mini-split-condensate-drain-problems/): Trace mini-split condensate leaks through pan, hose, slope, pump and wall penetration checks while separating drainage faults from coil icing and humidity.
- [Supply-Side vs Return-Side Duct Leakage: Why Location Matters](https://coolingloadguide.com/supply-vs-return-duct-leakage/): Compare supply-side and return-side duct leakage, including operating pressure direction, comfort effects and the measurements needed to locate each path.
- [Thermostat C-Wire Requirements: Power Symptoms and Safe Checks](https://coolingloadguide.com/thermostat-c-wire-requirements-symptoms/): Learn what a thermostat C-wire does, which power symptoms suggest a circuit problem and why adapters, unused conductors and compatibility require wiring.
- [Pressure Pan Testing: Finding Duct Connections to Outdoors](https://coolingloadguide.com/pressure-pan-duct-testing/): Learn how pressure-pan testing screens individual registers for duct connections to outdoors, what a high reading suggests and why it is not a CFM test.
- [Thermostat Remote Sensor Averaging: Comfort and Setup Limits](https://coolingloadguide.com/thermostat-remote-sensor-averaging/): Understand thermostat remote-sensor averaging, occupancy selection, schedules and placement limits so one comfortable room does not hide another room’s load.
- [Mini-Split Indoor Head Icing: Airflow, Load, and Refrigerant Boundaries](https://coolingloadguide.com/mini-split-indoor-head-icing/): Diagnose ice on a mini-split indoor head by checking airflow, operating conditions and drainage before technician-only sensor and refrigerant measurements.
- [Single-Stage vs Multi-Stage Thermostat Control: What Changes](https://coolingloadguide.com/single-stage-vs-multi-stage-thermostat-control/): Compare single-stage and multi-stage thermostat control, including terminals, staging logic, equipment-board timers, comfort effects and commissioning checks.
- [Mini-Split Runs but Does Not Cool: A Measurement-Based Diagnosis](https://coolingloadguide.com/mini-split-running-not-cooling/): Trace a running mini-split that is not cooling by checking mode, air mixing, coil airflow, temperature response and technician-only refrigerant measurements.
- [Total Duct Leakage vs Leakage to Outside: What Changes](https://coolingloadguide.com/total-duct-leakage-vs-outside/): Compare total duct leakage with leakage to outside, including the test boundaries, equipment required and why the two CFM25 values answer different questions.
- [Mini-Split Short Cycling: Load, Control, and Installation Causes](https://coolingloadguide.com/mini-split-short-cycling-causes/): Diagnose mini-split short cycling by separating low load and minimum capacity from sensor, airflow, refrigerant and control issues under measured conditions.
- [CFM25 Explained: How Duct Leakage Results Are Compared](https://coolingloadguide.com/cfm25-duct-leakage-explained/): Understand what CFM25 represents, why floor-area normalization matters and which test conditions must match before two duct leakage results are compared.
- [Thermostat Compressor Protection Delay: Why Cooling Waits to Start](https://coolingloadguide.com/thermostat-compressor-protection-delay/): Learn why a thermostat delays compressor restart, how to distinguish normal off-time protection from a lost call and when the outdoor unit needs diagnosis.
- [Duct Blaster Test: Setup, Procedure, and Useful Results](https://coolingloadguide.com/duct-blaster-test-procedure-results/): See how a Duct Blaster test seals registers, controls duct pressure and measures leakage, including setup details needed for a defensible result.
- [Thermostat Temperature Differential and Deadband Explained](https://coolingloadguide.com/thermostat-temperature-differential-deadband/): Understand thermostat differential and deadband, including display rounding, sensor accuracy, staging and why a universal temperature swing does not fit every.
- [Multi-Zone Mini-Split Sizing: Capacity, Diversity, and Head Selection](https://coolingloadguide.com/multi-zone-mini-split-sizing/): Size a multi-zone mini-split by checking room loads, connected capacity, diversity, minimum output and manufacturer combination tables at design conditions.
- [Thermostat Cycle Rate: What It Controls and How to Set It](https://coolingloadguide.com/thermostat-cycle-rate/): Learn what thermostat cycle rate controls, why equipment type matters and how to verify comfort and runtime before changing model-specific installer settings.
- [Room-by-Room Mini-Split Sizing: Match Capacity to Each Zone](https://coolingloadguide.com/room-by-room-mini-split-sizing/): Size mini-split zones room by room by comparing design loads, head capacity, turndown, air mixing and manufacturer combination data before selection.
- [Residential Duct Leakage Testing: What the Test Measures](https://coolingloadguide.com/residential-duct-leakage-testing/): Learn how residential duct leakage testing measures openings at a stated pressure, what the result cannot locate, and which conditions affect the reading.
- [AC Temperature Split Too Low: Why the Air Is Not Cold Enough](https://coolingloadguide.com/ac-temperature-split-too-low/): A low AC temperature split means the supply air is not much cooler than return air, but the cause may be airflow, refrigerant, load or measurement error.
- [Dual-Fuel Heat Pump Changeover Temperature Explained](https://coolingloadguide.com/dual-fuel-heat-pump-changeover-temperature/): Dual-fuel changeover depends on capacity, operating cost, equipment limits and controls. Learn why one universal outdoor temperature does not fit every system.
- [Latent Capacity vs Total AC Capacity: Why the Difference Matters](https://coolingloadguide.com/latent-vs-total-ac-capacity/): Total AC capacity includes sensible and latent work. Learn how latent capacity is identified, why nominal tonnage cannot predict it and what affects it.
- [Combustion Air for a Furnace: Why the Mechanical Room Matters](https://coolingloadguide.com/furnace-combustion-air-mechanical-room/): A furnace room needs an approved combustion-air strategy based on appliances, enclosure, exhaust equipment and venting—not an arbitrary wall opening.
- [Subcooling Too Low: Undercharge, Flash Gas, or a Bad Reading?](https://coolingloadguide.com/subcooling-too-low/): Low subcooling may come from undercharge, insufficient liquid, flash gas, operating conditions or a bad reading. Learn why it does not prove a leak alone.
- [AC Temperature Split Too High: Causes and Next Checks](https://coolingloadguide.com/ac-temperature-split-too-high/): A high AC temperature split often points to low airflow, but refrigerant and measurement conditions also have to be checked.
- [Furnace Error Light Flashing: How to Read the Code Safely](https://coolingloadguide.com/furnace-error-light-flashing-read-code/): Learn how to record a furnace flashing-light code safely, match it to the exact model, preserve fault history, and avoid treating a code as a part diagnosis.
- [Why Square Foot AC Sizing Fails in High-Humidity Homes](https://coolingloadguide.com/square-foot-ac-sizing-high-humidity/): Square-foot sizing fails in humid homes because latent load and runtime matter as much as sensible temperature drop.
- [Overcharged AC vs Restricted Airflow: Why the Symptoms Can Overlap](https://coolingloadguide.com/overcharged-ac-vs-restricted-airflow/): Overcharge and restricted airflow can create overlapping pressure, temperature and cycling symptoms. Learn how technicians separate charge from air-side faults.
- [How Much Backup Heat Does a Heat Pump Need?](https://coolingloadguide.com/how-much-backup-heat-heat-pump/): Calculate heat-pump backup from the design-load shortfall, operating sequence and delivered output. Learn why default strip-kit sizing can mislead.
- [Furnace Runs Constantly but the House Stays Cold](https://coolingloadguide.com/furnace-runs-constantly-house-stays-cold/): A furnace running constantly can reflect load, reduced output, duct loss, airflow, or thermostat bias. Learn what observations and measurements separate them.
- [Low Sensible Cooling Load: Why the AC May Not Control Humidity](https://coolingloadguide.com/low-sensible-load-ac-humidity/): When sensible cooling load is low, the thermostat may stop AC operation while latent moisture continues. Learn when independent dehumidification may be needed.
- [Sealed Combustion vs Direct Vent Furnace](https://coolingloadguide.com/sealed-combustion-vs-direct-vent-furnace/): Sealed combustion describes isolation from indoor air; direct vent describes an approved outdoor intake and exhaust arrangement.
- [AC Temperature Split Explained: What the Supply-Return Difference Means](https://coolingloadguide.com/ac-temperature-split-explained/): AC temperature split is the difference between return-air temperature and supply-air temperature, and it is useful only when airflow and conditions are considered.
- [Room-by-Room Cooling Load: Why Whole-House Tons Are Not Enough](https://coolingloadguide.com/room-by-room-cooling-load/): Room-by-room cooling load explains where the cooling is needed, not just how many tons the whole house requires.
- [Heat Pump COP by Outdoor Temperature: What the Number Means](https://coolingloadguide.com/heat-pump-cop-outdoor-temperature/): Learn how heat-pump COP changes with outdoor temperature, why it differs from capacity and HSPF2, and how to compare certified operating points.
- [Superheat Too Low: Causes and Compressor Floodback Risk](https://coolingloadguide.com/superheat-too-low/): Low superheat can indicate evaporator overfeeding, low load, restricted airflow or control behavior. Learn why it raises floodback concerns without proving overcharge.
- [Blower Speed Too Low in Cooling Mode: Symptoms and Risks](https://coolingloadguide.com/blower-speed-too-low-cooling-mode/): If blower speed is too low in cooling mode, the system may have weak airflow, excessive temperature split, icing or poor room distribution.
- [How Duct Heat Loss Affects Furnace Sizing](https://coolingloadguide.com/duct-heat-loss-furnace-sizing/): Furnace output is measured at the appliance, while ducts can lose heat and airflow before rooms receive it. Distribution loss requires explicit analysis.
- [Blower-Off Delay and Moisture Re-Evaporation Explained](https://coolingloadguide.com/blower-off-delay-moisture-reevaporation/): A blower-off delay can recover sensible cooling but may pass air over a wet coil. Learn how delay length, drainage and controls affect re-evaporation.
- [Ducts in a Hot Attic: How They Affect Cooling Capacity](https://coolingloadguide.com/ducts-in-hot-attic-cooling-capacity/): Ducts in a hot attic can reduce delivered cooling even when the outdoor unit has enough rated capacity.
- [Furnace Will Not Restart After a Power Outage](https://coolingloadguide.com/furnace-will-not-restart-after-power-outage/): If a furnace will not restart after an outage, check thermostat demand and visible power clues safely, preserve fault codes, and avoid repeated breaker resets.
- [Heat Pump Balance Point: Capacity vs Economic Balance Point](https://coolingloadguide.com/heat-pump-capacity-economic-balance-point/): Learn the difference between a heat pump capacity balance point and economic balance point, how each is determined, and why neither is a universal setting.
- [Can Leaky Ducts Pull Humid Air Into the House?](https://coolingloadguide.com/leaky-ducts-pull-humid-air/): Return leaks can draw humid attic or crawlspace air; supply leaks can change house pressure. Learn why duct location and pressure determine humidity impact.
- [How Infiltration Changes Heating Load](https://coolingloadguide.com/infiltration-heating-load/): Infiltration load is the heat required to warm uncontrolled outdoor air entering through enclosure and duct leaks. Airflow estimation is the critical input.
- [Condensing Saturation Temperature: What It Reveals About Heat Rejection](https://coolingloadguide.com/condensing-saturation-temperature/): Learn how high-side pressure becomes condensing saturation temperature and how outdoor airflow, ambient conditions and refrigerant state affect it.
- [AC Static Pressure Test: What Homeowners Should Understand](https://coolingloadguide.com/ac-static-pressure-test/): An AC static pressure test measures how hard the blower is working against duct, filter and coil resistance.
- [Clogged Furnace Condensate Drain: Why a High-Efficiency Furnace Stops](https://coolingloadguide.com/clogged-furnace-condensate-drain/): Learn how a clogged condensate drain can stop a high-efficiency furnace, what water clues are safe to inspect, and why vent and pressure checks still matter.
- [Occupancy Heat Gain in AC Load Calculations](https://coolingloadguide.com/occupancy-heat-gain-ac-load/): People add sensible and latent heat to a home, but occupancy is only one part of the cooling load.
- [Superheat Too High: Causes and What Technicians Check](https://coolingloadguide.com/superheat-too-high/): High superheat can reflect low evaporator feeding, undercharge, restriction, high load or measurement error. Learn how technicians separate the causes.
- [Heat Pump Runs Constantly in Winter: Is That Normal?](https://coolingloadguide.com/heat-pump-runs-constantly-winter/): Long heat-pump runtime can be normal in cold weather. Learn how indoor temperature trend, auxiliary heat, airflow and model capacity show when service is needed.
- [Can a Dirty Filter Make a Furnace Short Cycle?](https://coolingloadguide.com/dirty-filter-furnace-short-cycling/): A dirty furnace filter can restrict airflow and open the high limit, but it is not the only cause of short cycling. Learn the safe checks and measurements.
- [How Humidity Changes a Manual J Cooling Load](https://coolingloadguide.com/humidity-manual-j-cooling-load/): Learn how outdoor moisture, infiltration, ventilation, occupants and indoor design conditions create latent load inside a Manual J cooling calculation.
- [Manual J Heating Design Temperature Explained](https://coolingloadguide.com/heating-design-temperature-manual-j/): Heating design temperature is a standardized local weather condition used to calculate peak load—not the coldest temperature ever recorded.
- [Bedroom Return Air Problems: Why Rooms Get Hot With the Door Closed](https://coolingloadguide.com/bedroom-return-air-problems/): A bedroom can get hot with the door closed when supply air cannot return to the system without a pressure path.
- [Kitchen Heat Gain and AC Sizing: Appliances, Sun, and Runtime](https://coolingloadguide.com/kitchen-heat-gain-ac-sizing/): Kitchen heat gain affects AC runtime and room comfort, but it should be counted as an internal load rather than guessed as extra tonnage.
- [Cold-Climate Heat Pump vs Standard Heat Pump](https://coolingloadguide.com/cold-climate-vs-standard-heat-pump/): Compare cold-climate and standard heat pumps using certified low-temperature capacity, COP, controls, sizing and backup needs—not marketing labels.
- [Refrigerant Restriction vs Undercharge: How the Readings Differ](https://coolingloadguide.com/refrigerant-restriction-vs-undercharge/): Restrictions and undercharge can both starve an evaporator. Learn how temperature drops, superheat, subcooling and liquid-line evidence separate them.
- [Why Two-Story Homes Often Need More Return Air](https://coolingloadguide.com/two-story-home-return-air/): Two-story homes often need better return paths because upstairs rooms can become pressure isolated when doors close and duct runs are long.
- [Heat Pump Low-Ambient Cutout Explained](https://coolingloadguide.com/heat-pump-low-ambient-cutout/): A low-ambient cutout intentionally blocks heat-pump compressor operation below defined conditions. The correct setting depends on equipment, load and backup heat.
- [Dew Point vs Relative Humidity for Air-Conditioned Homes](https://coolingloadguide.com/dew-point-vs-relative-humidity-home/): Relative humidity changes with temperature; dew point tracks moisture content differently. Learn which reading helps explain comfort, condensation and AC load.
- [Sunroom AC Sizing: Why Additions Are Hard to Cool](https://coolingloadguide.com/sunroom-ac-sizing/): Sunrooms often need special load treatment because glass exposure can dominate the cooling load.
- [Furnace Rollout Switch Tripped: Why the System Should Stay Off](https://coolingloadguide.com/furnace-rollout-switch-tripped/): A tripped furnace rollout switch is a combustion-safety stop. Learn why not to reset it, what warning signs matter, and what must be inspected.
- [Why Is Auxiliary Heat On So Often?](https://coolingloadguide.com/auxiliary-heat-on-so-often/): Frequent auxiliary heat can reflect defrost, recovery, cold-weather capacity or a control problem. Learn what to observe before changing thermostat settings.
- [Whole-House Dehumidifier Sizing: Pints per Day and Moisture Load](https://coolingloadguide.com/whole-house-dehumidifier-sizing/): Size a whole-house dehumidifier from moisture load, rating conditions, climate, ventilation, infiltration and volume—not square footage alone.
- [Demand Defrost vs Time-Temperature Defrost](https://coolingloadguide.com/demand-defrost-vs-time-temperature-defrost/): Time-temperature defrost uses runtime and coil temperature; demand defrost adds evidence intended to identify actual frost need.
- [Target Superheat vs Actual Superheat](https://coolingloadguide.com/target-vs-actual-superheat/): Learn how target superheat is derived from equipment and operating conditions, how actual superheat is measured, and why no universal target applies.
- [Outdoor AC Unit Turns On Then Off: Common Causes](https://coolingloadguide.com/outdoor-ac-unit-turns-on-then-off/): An outdoor unit that turns on then off can be responding to thermostat delay, a safety switch, an electrical fault, a fan problem or abnormal refrigerant pressure.
- [Furnace High-Limit Switch Keeps Tripping: Airflow Causes and Risks](https://coolingloadguide.com/furnace-high-limit-switch-keeps-tripping/): Learn how restricted airflow, temperature rise, blower setup, filters, coils, and ducts can trip a furnace high-limit switch—and why bypassing it is unsafe.
- [Open Floor Plan AC Sizing: Why One Big Zone Can Still Feel Uneven](https://coolingloadguide.com/open-floor-plan-ac-sizing/): Open floor plans can still feel uneven when solar gain, kitchen load, returns and thermostat location are not balanced.
- [Evaporator Saturation Temperature: What It Reveals About the Coil](https://coolingloadguide.com/evaporator-saturation-temperature/): Learn what low-side saturation temperature reveals about evaporator conditions, airflow and load—and why it is not the temperature of every coil surface.
- [How Long Does a Heat Pump Defrost Cycle Take?](https://coolingloadguide.com/heat-pump-defrost-cycle-duration/): Heat-pump defrost duration and frequency are model- and weather-specific. Learn what to observe, why cycles end, and which patterns indicate a fault.
- [Furnace Pressure Switch Open Fault: What the Code Means](https://coolingloadguide.com/furnace-pressure-switch-open-fault/): A pressure-switch open code does not automatically mean a bad switch. Learn how the inducer, vent, condensate, tubing, and controls affect the fault.
- [AC Blower Airflow and Latent Capacity: Why Dehumidification Changes](https://coolingloadguide.com/ac-blower-airflow-latent-capacity/): Blower airflow changes coil temperature and the sensible-latent capacity split. Learn why lower airflow is not a universal humidity fix and requires testing.
- [What Does a Heat Pump Crankcase Heater Do?](https://coolingloadguide.com/heat-pump-crankcase-heater/): A crankcase heater keeps the compressor warmer during off cycles so refrigerant is less likely to condense into and dilute the oil.
- [AC Compressor Starts Then Shuts Off: Short Cycle or Protection Trip?](https://coolingloadguide.com/ac-compressor-starts-then-shuts-off/): A compressor that starts then shuts off may be short cycling, tripping on overload or being stopped by a pressure or control safety.
- [Vaulted Ceiling AC Sizing: Comfort Risks in Tall Rooms](https://coolingloadguide.com/vaulted-ceiling-ac-sizing/): Vaulted ceilings can increase cooling load and comfort risk through volume, roof exposure and stratification.
- [Should You Size a Heat Pump for the Heating or Cooling Load?](https://coolingloadguide.com/size-heat-pump-heating-vs-cooling-load/): Heat-pump sizing must reconcile heating and cooling loads, certified performance, humidity, ducts and backup—not simply choose the larger load.
- [Subcooling Too High: Causes and Next Checks](https://coolingloadguide.com/subcooling-too-high/): High subcooling may reflect overcharge, liquid backing, condenser conditions, a restriction or measurement error. Learn how technicians choose the next check.

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