Why Square Foot AC Sizing Fails in High-Humidity Homes
Square-foot sizing fails in humid homes because latent load and runtime matter as much as sensible temperature drop.
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Overcharged AC vs Restricted Airflow: Why the Symptoms Can Overlap
Overcharge and restricted airflow can create overlapping pressure, temperature and cycling symptoms. Learn how technicians separate charge from air-side faults.
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How Much Backup Heat Does a Heat Pump Need?
Calculate heat-pump backup from the design-load shortfall, operating sequence and delivered output. Learn why default strip-kit sizing can mislead.
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Furnace Runs Constantly but the 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.
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Low Sensible Cooling Load: Why the AC May Not Control Humidity
When sensible cooling load is low, the thermostat may stop AC operation while latent moisture continues. Learn when independent dehumidification may be needed.
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Sealed Combustion vs Direct Vent Furnace
Sealed combustion describes isolation from indoor air; direct vent describes an approved outdoor intake and exhaust arrangement.
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AC Temperature Split Explained: What the Supply-Return Difference Means
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.
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Room-by-Room Cooling Load: Why Whole-House Tons Are Not Enough
Room-by-room cooling load explains where the cooling is needed, not just how many tons the whole house requires.
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Heat Pump COP by Outdoor Temperature: What the Number Means
Learn how heat-pump COP changes with outdoor temperature, why it differs from capacity and HSPF2, and how to compare certified operating points.
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Superheat Too Low: Causes and Compressor Floodback Risk
Low superheat can indicate evaporator overfeeding, low load, restricted airflow or control behavior. Learn why it raises floodback concerns without proving overcharge.