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Why is My Furnace Heating Inconsistently?

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Why is My Furnace Heating Inconsistently?

Posted On: December 23, 2024

Why is My Furnace Heating Inconsistently?

Inconsistent heating from your furnace can be frustrating, especially during colder months. Here are some common reasons your furnace might not be heating evenly or consistently:


1. Clogged or Dirty Air Filters

  • Problem: A dirty filter restricts airflow, causing uneven heating throughout your home.
  • Solution: Replace or clean the air filters regularly, typically every 1-3 months, depending on usage.

2. Thermostat Issues

  • Problem: A malfunctioning thermostat might misread temperatures or fail to communicate with your furnace effectively.
  • Solution: Check the thermostat’s settings and batteries. If issues persist, consider recalibrating or replacing the thermostat.

3. Blocked or Leaky Ductwork

  • Problem: Air ducts that are blocked, leaking, or poorly insulated can prevent warm air from reaching certain areas of your home.
  • Solution: Inspect ducts for obstructions or damage. Seal leaks and ensure proper insulation.

4. Incorrect Furnace Size

  • Problem: A furnace that is too small for your home may struggle to heat all rooms evenly. Conversely, an oversized furnace may short-cycle, causing uneven temperatures.
  • Solution: Have a professional HVAC technician assess your furnace size and capacity.

5. Aging Furnace

  • Problem: Older furnaces may lose efficiency over time, resulting in inconsistent heating.
  • Solution: Schedule a professional inspection to determine if repairs or replacement are necessary.

6. Faulty Blower Motor

  • Problem: A malfunctioning blower motor may not distribute warm air effectively throughout your home.
  • Solution: Have an HVAC professional inspect and repair or replace the blower motor if needed.

7. Dirty Burners

  • Problem: Dirt or debris on the burners can lead to incomplete combustion and uneven heating.
  • Solution: Regular maintenance and cleaning of the furnace burners can prevent this issue.

8. Drafts or Poor Insulation

  • Problem: Cold drafts or poorly insulated areas can cause temperature fluctuations, even if the furnace is functioning correctly.
  • Solution: Seal windows and doors, and improve insulation in areas where heat loss is occurring.

9. Zoning Issues

  • Problem: Without proper zoning, some rooms may receive more heat than others, depending on the layout of your ductwork and vents.
  • Solution: Consider adding a zoning system to better control the heat distribution in your home.

10. Pilot Light or Ignition Issues

  • Problem: An intermittent pilot light or faulty ignition system can cause the furnace to cycle erratically.
  • Solution: Have the ignition system inspected and repaired by a qualified technician.

When to Call a Professional

If you’ve tried troubleshooting and your furnace continues to heat inconsistently, it’s best to call a licensed HVAC technician. They can diagnose the problem accurately and recommend the best course of action to restore even heating in your home.



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See What Our Customers Are Saying:

by Private User on Twintech Heating and Cooling

Twintech promptly responded to request for quotation. They were thorough and helpful in explaining options. The quote was very competitive. Installation of new furnace was very professionally completed. Excellent work.

by Rita, Scarborough on Twintech Heating and Cooling

When our old oil furnace finally broke down we decided it was time to finally convert to natural gas and finally install central air conditioning at the same time. Knowing it was going to be a significant investment for us, we wanted to make the right choice. Twintech came highly recommended by a friend and we were not disappointed. From the first contact with the salesperson, until the final touches on the installation, we were so pleased with their service. Everyone from the company was so friendly, efficient and a pleasure to deal with. Best of all, the cost was very competitive. We would certainly recommend Twintech to anyone requiring HVAC work in their home.

by Bob S, Pickering on Twintech Heating and Cooling

Mitch from Twintech came out for our annual furnace inspection. We found him to be friendly, conscientious & he left the work area clean. We were also very impressed with the thoroughness of the job he did. This is the 2nd job we’ve had Twintech do for us & have been very happy with the results for each. We highly recommend this company. Thank you, Mitch, Dave & Greg.

by Brent L on Twintech Heating and Cooling

Work was done on schedule, professionally, according to quote and with minimal inconvenience to building users. Very happy with the end result. The only area for improvement from my experience - need more timely quoting process.

by Karen on Twintech Heating and Cooling

The team was great! Very knowledgeable, professional and extremely helpful. A few days after install the unit didn’t seem to be working, user error, but within minutes of contacting them..on a Saturday.. a tech was on the phone troubleshooting with us. I highly recommend Twintech for your cooling or heating needs. They stand by their products and a pleasure to deal with.

by Rob on Twintech Heating and Cooling

During the hottest week in the summer our old A/C decided to call it quits. I called Twintech Heating & Cooling after receiving a referral from a family member; came highly rated for being an honest, family-run business, who appreciates their customers. Dave was able to accommodate my hectic schedule and book a late evening appointment to walk through the specifics. Greg and Mitch arrived exactly on time a few days later, were very polite and friendly, and within a couple of hours had a new unit up and running. I also received a follow-up call to ensure we were happy with the Amana.

by Linda Robinson on Twintech Heating and Cooling

They were on time and very professional. I'm so glad I decided to go with Twintech, thanks!

by Famcam1953 on Twintech Heating and Cooling

Timely and appreciated - this was during the hottest days this year when our Air and Furnace way.
Efficient. Professional. No BS or overselling. What was promised, was delivered at a cost-effective price point.
Down to earth.

by DG Sellers on Twintech Heating and Cooling

Professionally done and took care to cover all entry floors to the house for the installers to remove the old furnace and install a new furnace.
I also made recommendations of the tankless water heater that we had installed and items to address. We did not know they also installed tankless water heaters.

by Bill, Pickering on Twintech Heating and Cooling

Price was not the cheapest nor the most expensive of my quotes. It's the quality of the installation that makes for a good AC system. The twins' knowledge & professionalism was evident in the small details:
Very clean work. Greg made sure that the refrigerant level & temperature were correct. They reinstall the insulation & vapor barrier around the wall. The outside electrical cords were secured to the wall. Proud to support this local company. Thank you.

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

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