What Size AC Do I Need in St. Petersburg, FL?
Plan AC sizing for a St. Petersburg, Florida home with local climate, building details, Manual J, matched equipment, airflow, and moisture—not square feet alon.
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What Size AC Do I Need in Port St. Lucie, FL?
Plan AC sizing for a Port St. Lucie, Florida home with local climate, building details, Manual J, matched equipment, airflow, and moisture—not square feet alon.
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What Size AC Do I Need in Brownsville, TX?
Plan AC sizing for a Brownsville, Texas home with local climate, building details, Manual J, matched equipment, airflow, and moisture—not square feet alone.
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What Size AC Do I Need in Baton Rouge, LA?
Plan AC sizing for a Baton Rouge, Louisiana home with local climate, building details, Manual J, matched equipment, airflow, and moisture—not square feet alone.
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Furnace Size Calculator: BTU by Home Size, Climate, and AFUE
The furnace size you need starts with the home’s design heat loss, not a universal BTU-per-square-foot number. Estimate the output BTU/h required to replace heat lost through the envelope and air leakage, then compare that load with a furnace’s output capacity. AFUE is used to relate approximate input BTU to useful output. Output BTU is…
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Room Cooling Capacity Screening for Mini-Split Planning
This tool screens one room’s cooling capacity with the public ENERGY STAR room-air-conditioner table. It does not size a complete mini-split system, select an indoor head, calculate a room heating load, or determine an outdoor unit. Use the result only as an early room-cooling reference before a room-by-room load calculation and manufacturer selection workflow. What…
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Heat Pump Load and Low-Temperature Capacity Check
This tool compares a screening heating load with the low-temperature capacity the user enters from manufacturer expanded performance data. It also shows a sensible cooling screen. The result is a capacity-gap check, not automatic heat-pump sizing, a tonnage recommendation, or a substitute for Manual J and Manual S. Why the controlling load changes by house…
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Heating BTU Calculator: BTU Needed by Square Foot and Climate
Heating BTU needed is the design heat loss in BTU per hour. The estimate should reflect the room or building envelope, air leakage, indoor setpoint, and local outdoor design temperature. This page estimates that load; it does not select a furnace, boiler, heat pump, or electric circuit. A component estimate instead of BTU per square…
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Window AC BTU Calculator: What Size Unit Do You Need?
Choose a window air conditioner by the room load, not whole-house central-AC tonnage. Start with room square footage, then account for ceiling height, sun, occupancy, kitchen heat, insulation, and local climate. ENERGY STAR room-size foundation The calculator uses the current ENERGY STAR room-air-conditioner capacity bins as its base. Examples include 5,000 BTU/h for up to…
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HVAC Load Calculator: Heating and Sensible Cooling Estimate
An HVAC load is the rate of heat a building gains in summer or loses in winter. This calculator estimates a winter heating screening load and a summer sensible cooling screening load from envelope conductance, sensible air leakage, indoor and outdoor design temperatures, entered window solar gain, and entered internal sensible gains. It is intentionally…