Sunroom AC Sizing: Why Additions Are Hard to Cool
Sunrooms often need special load treatment because glass exposure can dominate the cooling load.
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Furnace Rollout Switch Tripped: Why the System Should Stay Off
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.
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Why Is 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.
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Whole-House Dehumidifier Sizing: Pints per Day and Moisture Load
Size a whole-house dehumidifier from moisture load, rating conditions, climate, ventilation, infiltration and volume—not square footage alone.
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Demand Defrost vs Time-Temperature Defrost
Time-temperature defrost uses runtime and coil temperature; demand defrost adds evidence intended to identify actual frost need.
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Target Superheat 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.
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Outdoor AC Unit Turns On Then Off: Common Causes
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.
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Furnace High-Limit Switch Keeps Tripping: Airflow Causes and Risks
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.
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Open Floor Plan AC Sizing: Why One Big Zone Can Still Feel Uneven
Open floor plans can still feel uneven when solar gain, kitchen load, returns and thermostat location are not balanced.
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Evaporator Saturation Temperature: What It Reveals About the Coil
Learn what low-side saturation temperature reveals about evaporator conditions, airflow and load—and why it is not the temperature of every coil surface.