Emergency Heating Checklist: What to Do Before You Call an HVAC Tech
- ryan4017
- Dec 3, 2025
- 2 min read
It’s 2 AM. It’s freezing. Your heat’s out. Now what?
Before you panic (or spend money you might not need to), here’s a quick emergency checklist to help you troubleshoot common heating issues—and decide whether it’s time to call in the pros.
Step 1: Check the Thermostat (Yes, Really)
Sometimes the issue is as simple as a thermostat that got bumped. Make sure:
It’s set to “Heat”
The temperature is set higher than the current room temp
The batteries aren’t dead (for battery-powered thermostats)
Pro Tip: If your thermostat is blank or flickering, change the batteries first—it could save you a cold night and a service call.
Step 2: Inspect the Breaker Panel
If your furnace isn’t doing anything at all—no hum, no fan, no lights—it might’ve tripped a breaker. Look for a breaker labeled “Furnace” or “HVAC” and reset it by switching it fully off, then back on.
Still nothing? Could be a blown fuse or a short. Keep reading.
Step 3: Check the Furnace Filter
A clogged air filter can cause your furnace to overheat and shut down.Pull out the filter and hold it up to a light. If you can’t see through it—it’s time to change it.
Don’t have a filter on hand? Remove the dirty one temporarily and see if the system kicks back on (but replace it ASAP).
Step 4: Listen for Strange Noises
If the furnace turns on but sounds like it’s struggling (clicking, banging, or whining), don’t ignore it.These sounds could mean:
A failing ignitor
Blower motor issues
Something caught in the fan blades
No noise at all? Then it’s likely an ignition or power issue.
Step 5: Smell Anything Funny?
Burning dust smell is normal when first turning on heat for the season.
Electrical or metallic smells? Not normal. Shut it down and call immediately.
Gas smell? Get out and call your utility provider before calling a tech.
Gas leaks are emergencies. Call 911 or your utility provider if in doubt.
Step 6: Is It Just One Room?
If some rooms are cold but others are fine, check:
Room vents (they may be closed or blocked)
Ductwork in the basement/attic (look for gaps or damage)
The zoning settings if you have a smart system
When It’s Time to Call the Pros
If you’ve gone through this checklist and still have no heat or if anything seems unsafe DON'T WAIT IT OUT! Heating problems tend to get worse the longer they’re ignored.
Call Guaranteed Mechanical Services in Connecticut at (860) 500-6420 for fast, local emergency service. We’re available and can help get your heat back on safely and quickly.
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