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No Heat in the House? What to Do With Your HVAC System
Posted On: February 6, 2026
Waking up to a cold house in the middle of winter is stressful—and sometimes alarming.
When your heat suddenly stops working, the problem may be simple, or it may require professional HVAC repair.
At Twintech Heating & Cooling, we help homeowners restore heat quickly and safely.
If you have no heat in your house, here’s what to do before—and when—to call an HVAC professional.
Step 1: Check Your Thermostat First
Before assuming the worst, start with the thermostat.
Make sure:
It’s set to HEAT, not COOL or OFF
The temperature is set higher than the current room temperature
Batteries are fresh (if applicable)
The display is on and responsive
If the thermostat isn’t sending a signal, your HVAC system won’t turn on.
Step 2: Check the Circuit Breaker and Power Supply
Your furnace or heat pump needs power to operate.
Look for:
Tripped breakers labeled “furnace,” “air handler,” or “HVAC”
A shut-off switch near the furnace that may have been turned off
A blown fuse if your system uses one
Reset a tripped breaker once.
If it trips again, stop and call a professional.
Step 3: Inspect the Air Filter
A clogged air filter can restrict airflow enough to shut down your heating system as a safety precaution.
If the filter looks dirty:
Replace it immediately
Restart the system
Wait a few minutes to see if heat returns
In winter, filters often need replacing every 30–60 days.
Step 4: Look for Furnace Error Codes
Many modern furnaces have a blinking light or digital display that shows error codes.
These codes can indicate:
Ignition failure
Flame sensor issues
Pressure switch problems
Airflow restrictions
If you see a code, note it—but don’t attempt repairs unless you’re trained to do so.
Step 5: Check the Pilot Light or Ignition (Gas Furnaces)
If you have a gas furnace:
Make sure the gas valve is on
Check whether the pilot light is out (older systems)
Listen for ignition attempts
If you smell gas, leave the home immediately and contact your gas provider or emergency services.
Step 6: Check Outdoor Units (Heat Pumps)
If you use a heat pump:
Make sure the outdoor unit isn’t buried in snow or ice
Clear debris and ensure airflow
Allow time for defrost cycles to complete
Heat pumps may blow cooler air during defrost—this is normal—but they should not stop heating altogether.
When Not to DIY
Stop troubleshooting and call a professional if:
The system repeatedly shuts down
You hear loud banging, screeching, or grinding
There’s a burning or gas smell
Breakers keep tripping
The system turns on but never produces heat
Continuing to reset or restart a failing system can cause further damage.
How Twintech Can Help Restore Heat Fast
At Twintech Heating & Cooling, we prioritize no-heat calls because we know how urgent they are.
Our technicians quickly diagnose the issue, explain your options clearly, and get your heat back on safely.
Whether it’s:
Furnace repair
Heat pump troubleshooting
Emergency heating service
System replacement
We’re here when your home needs heat the most.
[BACK]
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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