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January HVAC Checklist - Keep Your Systems Running Smoothly
Posted On: January 6, 2026
January is often the coldest and most demanding month for HVAC systems in Ontario.
With heating systems running almost nonstop, this is when small issues can turn into costly breakdowns if left unchecked.
A simple January HVAC checklist can help homeowners maintain comfort, improve efficiency, and avoid unexpected repairs during the heart of winter.
Here’s what every homeowner should focus on in January to keep their HVAC system operating reliably.
Replace or Clean Your Air Filter
Your HVAC system works harder in winter, and dirty air filters restrict airflow, forcing the system to use more energy.
In January, homeowners should:
Check filters monthly
Replace disposable filters or clean reusable ones
Use the correct filter size and rating recommended for your system
Clean filters improve airflow, efficiency, and indoor air quality.
Check Thermostat Settings
Cold weather often leads homeowners to constantly adjust thermostat settings, which can increase energy usage.
Best practices include:
Keeping a consistent temperature
Avoiding frequent manual changes
Using programmable or smart thermostat schedules
Stable settings help your HVAC system run efficiently while maintaining comfort.
Inspect Vents and Registers
Blocked or closed vents reduce airflow and strain your heating system.
In January:
Ensure all vents are open and unobstructed
Move furniture, rugs, or curtains away from registers
Check for weak airflow that could signal a problem
Balanced airflow helps maintain even temperatures throughout your home.
Listen for Unusual Noises
January is the time to pay attention to how your system sounds.
New or unusual noises can indicate developing issues.
Watch for:
Rattling or buzzing sounds
Grinding or squealing noises
Loud cycling or short run times
Catching problems early can prevent mid-winter breakdowns.
Monitor Indoor Humidity Levels
Winter heating can dry out indoor air, leading to discomfort and potential health issues.
In January:
Monitor humidity levels
Consider using a humidifier if air feels dry
Watch for excess dryness or static buildup
Balanced humidity improves comfort and protects wood furniture and flooring.
Clear Snow and Ice from Outdoor Units
If your home uses a heat pump, the outdoor unit must stay clear of snow and ice.
Homeowners should:
Gently remove snow buildup after storms
Keep at least two feet of clearance around the unit
Avoid chipping ice with sharp tools
Proper airflow ensures efficient winter operation.
Check Carbon Monoxide Detectors
For homes with fuel-burning appliances, January is a critical time to confirm safety systems are working.
Be sure to:
Test carbon monoxide detectors
Replace batteries if needed
Ensure detectors are installed on every level of the home
This step is essential for winter safety.
Schedule Mid-Winter HVAC Maintenance
January is a good time to schedule a professional system check—especially if maintenance was missed earlier in the season.
A professional inspection can:
Identify wear or airflow issues
Improve system efficiency
Reduce the risk of emergency repairs
Extend equipment lifespan Stay Comfortable and Protected This January
A little attention goes a long way during Ontario’s coldest month.
Following this January HVAC checklist helps ensure your system runs efficiently, keeps your home warm, and avoids unexpected disruptions.
For homeowners in the Durham Region and Toronto, Twintech Heating & Cooling offers professional HVAC inspections, maintenance, and repairs to keep your system performing reliably all winter long.
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See What Our Customers Are Saying:
Jul 23, 2024
Twintech Heating & Cooling installed my furnace in 2022 and in fall of 2023 installed my Panasonic Heat Pump. Greg and Mitch did a great job. Helped me through the rebate process. Super happy with the Heat Pump. Only used my furnace 5 times this winter. Energy bills lower, carbon emissions lower.Thank you Twintech. I recommend highly!
Jul 18, 2024
Just had a new furnace installed by Twintech. I cant express how great these guys are at what they do. From the sales to installation they were professional all the way. Very reasonable pricing and courteous during the installation and willing to answer any questions I had. Highly recommended !!!
Jul 17, 2024
They've cleaned my furnace a couple of times and mentioned that the hot water tank standards were going to change soon so I decided to change mine out.
There were a few challenges during the process but the installers handled the problems without missing a stride! I now have really hot water again!
Jul 16, 2024
Highly recommend Twintech Heating company, we got honest and detailed information on what was needed to replace and install a new gas furnace. Bob and Greg made us feel comfortable withe process through their thorough explanation and knowledge of the right furnace for our needs. The professionalism and courteous friendly attitude towards the customer is what we liked the most as they treated us like family. So happy with our decision and new furnace we will be looking into get our rental water heater replaced and installed by Twintech team. We feel better having their knowledge on our side and will only trust them with any further maintenance of furnace.
Jul 15, 2024
Customer service and knowledge is priority in this industry, and Twintech has it. I've dealt with their team for maintenance and a furnace replacement. They're accommodating and make great recommendations, and came through at a great price over the big guys in the industry. They'll be my next call when I need service or maintenance.
Jul 14, 2024
I decided that the noises and age of the existing furnace which was old and not very efficient to replace it. Gave Greg a call and Grant and Greg got to work on it. Because of supply issues with the current heating type that would be an easier install Greg convinced me to change the location of the system and it would provide me better service for heat and efficiency. I had skeptical but went ahead anyway putting trust in Greg And Grant. Greg, Grant and Mitch came through and in 2 days had completely relocated my heating and A/C system. I can honestly say Greg was right my old house has been warmer and more evenly heated as it ever was. For anyone reading this rather long winded review can take my word for it, Twin Tech can take care of your needs.
Jul 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!!
Jan 4, 2023
Great Team! Furnace broke in the weekend, Bob visited same day and Greg installed new one on Monday. Team was professional, respectful and knowledgeable. Installation went very well, Greg found solutions to challenges, like hiding new conduits in the ceiling. Looks nice and new furnace is working great. Five Stars.
Jan 4, 2023
I used Twintech to install a new furnace for my home. Bob was terrific in explaining the sizing options and why the 2 stage furnace was the best option for me. Greg did a great job installing, clean and on time. Finished work looks great but the best part is how it works. The 2 stage heating is so much more comfortable. I run the fan continuously to keep the indoor air clean. Great investment! Would highly recommendTwintech!
Jan 4, 2023
Im going to start this by saying Im a very particular customer. My background is in mathematics and mechanical engineering so I have an eye for detail and a respect for technical knowledge.
Greg had already done an AC inspection and replaced a water heater tank and there was no question in my mind who to deal with replacing my rickety old furnace after it got pooched.
Bob dropped in ahead of time and clearly (and knowledgeably) outlined all technical, price and operational options.
Greg showed up on time, on the agreed date and did a fantastic job. (The OLD furnace was a house of horrors and was installed in a keystone cops sort of way- careless.)
The work Greg did was HIGHLY PROFESSIONAL and FAR MORE FUNCTIONAL than what I had.
Im also a musician with many instruments so maintaining predictable humidity/temperature is extremely important to me. Greg recognized this as did Bob. You NEVER feel like youre being brushed off.
In summary, if youre looking for PROFESSIONAL, QUALITY results by an EXPERIENCED, THOUGHTFUL team
(that also happen to be FRIENDLY and ATTENTIVE ) then youve come to the right page!!
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