Troubleshooting & Advice
What we would tell you on the phone. Some of these problems you can solve yourself in ten minutes — we would rather you did than paid us to do it.
Furnace Blowing Cold Air
Why a furnace runs but blows cold, the difference between a thermostat setting and a real fault, and when it is a safety issue rather than a comfort one.
Read itAC Running But Not Cooling
The five most common reasons an air conditioner runs without cooling, which ones you can check yourself, and the one symptom that means shut it off immediately.
Read itWhat Size AC Do I Need?
How air conditioner sizing actually works, why matching the old unit is a bad default, and why an oversized system makes your house less comfortable, not more.
Read itHow Often to Change Your HVAC Filter
Filter change intervals by filter type, why MERV ratings can work against you, and what to do during Bay Area smoke season.
Read it
Past the point of troubleshooting?
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