Weak Airflow in One Room: Tracing It Back
One register that barely blows while the others are fine points to a specific, findable cause.
Read the guideTroubleshooting
Symptom-by-symptom guides for figuring out what your system is doing.
Short Cycling in Cooling: On for Five Minutes, Off for Five
A system that starts and stops repeatedly is either oversized or protecting itself. Both are worth diagnosing.
Read the guideNoises From the Ducts and Registers: What Each One Means
Popping, whistling, roaring, rattling. Indoor HVAC noises point to specific and usually fixable causes.
Read the guideCommunicating Systems: When Your HVAC Talks to Itself
Modern variable-speed systems use a data bus instead of simple on-off wiring. That changes how they fail and who can fix them.
The Thermostat Says Cool, But Nothing Happens
Total silence is a different problem from a system that runs badly. Here is how to narrow it down.
A/C Not Cooling? Six Things to Check Before You Call Anyone
A meaningful share of no-cool calls turn out to be one of these six things. Ten minutes could save you a service fee.
Furnace Short Cycling: Why It Keeps Turning On and Off
A furnace that runs for three minutes and shuts off is protecting itself from something. Usually that something is airflow.
Why Your Upstairs Is Always Hotter (And What Actually Fixes It)
Nearly every two-story Valley home has this problem. The fixes range from free to expensive — here they are in order of cost.
A Field Guide to A/C Noises: Which Ones Mean Stop Immediately
Buzzing, clicking, screeching, grinding, banging. Each one points somewhere specific — and two of them mean shut the system off…
Ice on Your A/C Line: What a Frozen Coil Means and What to Do
Ice on the copper line at the outdoor unit is never normal. Here is the safe sequence to thaw it and the four causes worth chec…
Why Your A/C Runs Constantly But Never Quite Cools
A system that runs nonstop without reaching setpoint is telling you something specific. Here is how to narrow down which of the…
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