Something not working? Start here.
Honest diagnostic guides for the most common heating, cooling, water heater, and safety issues we get called about. Most have a few things you can check yourself before calling — and clear signals for when you should stop and pick up the phone.
Safety emergencies
CO detector going off
Carbon monoxide alarm sounding? Get out first, call second. Here's the emergency protocol and what causes CO in homes.
Open guide → EmergencyGas smell emergency
Smelling rotten egg / sulphur in your home? Don't investigate. Get out and call. Here's the exact protocol.
Open guide →Heating issues
Furnace blowing cold air
Furnace running but only blowing cold air? Step-by-step diagnostic with what to check yourself and when to call.
Open guide → InvestigateHeat pump iced up
Heat pump covered in ice in winter? Some frost is normal — but heavy ice that won't clear is a service call. Here's how to tell.
Open guide → InvestigateFurnace short cycling
Furnace turning on and off every few minutes? It's a common issue with several causes — some easy fixes, some that need real attention.
Open guide → InvestigateFurnace strange noises
Banging, squealing, clicking, whistling, or rumbling? Different sounds point to different problems — and some are urgent.
Open guide →Cooling issues
AC not cooling
Air conditioner running but house won't cool? Walk through the most likely causes, what to check yourself, and when to stop and call.
Open guide → UrgentFrozen AC coil
Ice on your AC's indoor coil or refrigerant lines? Stop running it immediately — here's why, how to thaw safely, and what to fix.
Open guide →Need a real diagnosis?
If self-diagnosis didn't solve it, we'll dispatch a TSSA-certified technician. Same-day for emergencies.
Mon–Fri 7:00 AM – 7:00 PM · Saturday 8:00 AM – 5:00 PM · 24/7 emergency service available