Categories
- AC Filters
- AC Repair
- Air Conditioner Maintenance
- Air Conditioner Repair
- Air Conditioners
- Air Conditioning Services
- Air Quality
- Cleaning Tips
- Cooling
- Duct System
- Ducted Air Conditioner
- Ductless Air Conditioner
- Emergency Repairs
- Energy Costs
- Expert Help
- Fans
- FAQ
- Filters
- Fireplaces
- Fun
- Furnace Installations
- Furnace Repairs
- Furnaces
- Gas Fireplaces
- Gas Line
- Gas Line Installations
- Heat Pumps
- Heating
- Heating and Cooling
- Heating Contractors
- heating system
- Heating Technicians
- Humidity
- HVAC
- HVAC Contractors
- HVAC experts
- HVAC Noises
- HVAC professionals
- HVAC Repairs
- HVAC Service
- Insulation
- Maintenance
- Natural Gas
- Pestibulum molestieenean
- Saving Money
- Water
- Water Heaters
- Work
[BACK]
Can a Furnace Unit be Oversized?
Posted On: March 18, 2025
a furnace can absolutely be oversized, and it’s a more common problem than you might think. While it may sound like having a more powerful furnace is a good thing, an oversized unit can actually cause several problems for your home’s comfort and efficiency.
Signs Your Furnace Might Be Oversized
-
Short Cycling — The furnace turns on and off frequently because it heats the space too quickly, shutting off before completing a full heating cycle. This leads to uneven temperatures and increased wear on the unit.
-
Uneven Heating — Some rooms may feel too warm, while others stay cold because the heat doesn’t distribute evenly before the system shuts off.
-
High Energy Bills — Short cycling uses more energy since the furnace draws the most power during startup. Constantly restarting increases your energy costs.
-
Excessive Wear and Tear — The repeated on/off cycling causes parts to wear out faster, leading to more frequent repairs and a shorter lifespan for the unit.
-
Poor Humidity Control — Furnaces also help control humidity levels in your home. An oversized unit doesn’t run long enough to properly remove moisture from the air, leaving you with a clammy, uncomfortable environment.
What Causes an Oversized Furnace Installation?
- Improper Load Calculation — If the HVAC contractor didn’t properly calculate your home’s heating load (taking into account square footage, insulation, windows, etc.), they may have installed a larger furnace than necessary.
- "Bigger is Better" Mentality — Some people assume a larger furnace will heat the home faster, but this actually leads to inefficiency and discomfort.
- Old House Upgrades — If you’ve added insulation, replaced windows, or improved energy efficiency, your original furnace may now be oversized for your current needs.
How to Fix an Oversized Furnace
- Replacement — The most effective fix is replacing the unit with one properly sized for your home. An HVAC professional can perform a Manual J Load Calculation to determine the right size.
- Adjustments — In some cases, technicians can modify the blower speed or adjust gas pressure to reduce output, but this is more of a temporary fix.
- Zoning Systems — If replacement isn’t an option, installing a zoning system can help direct heat to specific areas more effectively.
[BACK]
See What Our Customers Are Saying:
Apr 10, 2019
Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.
Apr 8, 2019
The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.
Apr 1, 2019
Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldnt believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!
Apr 1, 2019
Installation was done quickly and professionally. The new furnace is quiet and provides even heat.
Mar 3, 2019
They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!
Mar 4, 2019
This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!
Feb 22, 2019
Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.
Feb 16, 2019
Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.
Feb 13, 2019
Fantastic team. Completed the job as per the specifications and in under 3 hours. Highly recommended Twintech.
Jan 30, 2019
During the summer, I previously hired TwinTech to replace my air conditioner when it failed. They did an excellent job so when I decided to proactively replace the furnace I contacted them. The furnace I had was 22 years old and showed signs of internal leakage. It still worked but rather than wait to have it fail in cold weather, I decided to purchase a higher efficiency model before it failed and take advantage of energy efficiency rebates. TwinTech offered very useful advice on the make and model of furnace to choose including high efficiency and variable speed motor. The price was reasonable, TwinTech arrived at the allotted time, installed the new furnace (including some re-routing of exhaust lines since the existing ones were too close to other vents), removed the old furnace, tested the installation and cleaned everything up. Overall, it was a good experience, they did a great job and the new furnace is working well.
Related Links:
oshawa gas furnace problems, ac service call, pickering hvac prices, local ac services, ajax furnace inspection, ac repair services, whitby furnace replacement, furnace repairs pickering, oshawa hvac furnaces, central ac service, ac unit maintenance, pickering gas furnace problems, ac installation near me, ajax hvac repair, hvac repairs, ac contractors, ac repair and service, whitby furnaces, residential furnace, residential ac repair, pickering hvac furnace, pickering furnace service, pickering furnaces, oshawa furnace inspection, oshawa furnaces, nearby ac repair,