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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:
Jan 1, 2015
Really nice honest guys. It was a pleasure to do business with a company that does exactly what they say theyre going to do! My basement was cleaner after they installed my new furnace and AC. Thanks again Greg and Grant and for doing such a great job.
Jan 1, 2015
5 star service!! I had twin tech install a high efficiency furnace and hot water tank at my home. I am taking time to write this review as a thanks for what I viewed as next level service that went above and beyond. Prior to installation they explained my specific options without pushy sales tactics and up front costs. Greg and Grant replaced a large portion of the duct work (built in their own shop) that had rusted over the years which resulted in a great looking job. It was a pleasure to work with people are passionate and take pride in their work. Following the installation they explained all aspects and maintenance of the new equipment. Products have worked flawlessly. Thanks again Greg and Grant! Highly recommend!!
Jan 1, 2015
Twin Tech was great; they were honest, reliable and very thorough. I would recommend their services and will definitely be using them in the future.
Jan 1, 2015
Hi Dave, Thank You Dave for coming to my aid this past summer when my AC quit. Your men did a great job installing and cleaning the area. The unit is working very well and i would highly recommend your company TwinTech. Dave you delivered what you sold and i truly appreciate it.
Jan 1, 2015
My experience with TWINTECH has been excellent, start to finish. While doing market research I made a list of several local companies and called them for some high-level information. Dave was the first to call me back, and the only one to book a meeting to see my place in order to give an informed, accurate estimate. He reviewed the different AC makes and models with me, explained the technology, and made a recommendation appropriate to my home. The installation went smoothly. I had one post-installation issue there was moderate noise/vibrations coming from the duct system. I called about this, booked an appointment, and the technician resolved the issue during the service call. I feel assured having a 10-year warranty on parts & labour. I would recommend TWINTECH to anyone considering an AC or furnace for their home. Regards,
Jan 1, 2015
Thank you for your attention to detail regarding my purchase of a new air conditioner. Twintech arrived at the appointed time and were totally professional on the installation process completing the job quickly. PS thanks for the assistance applying for the government rebate
Jan 1, 2015
Dave and the guys from Twintech did a great job of installing my AC. They came on time did a nice neat job and cleaned up after themselves! Do not waste your time call Twintech first.
Jan 1, 2015
My AC unit was not working at all and our furnace that was still working but not giving us any trouble was over 15 years old. So I had 3 heating companies come out to give us a quote on replacing both the AC and the furnace at the same time. Two companies right away recommended that I replace both units simply because they were old. Dave from twintech however suggested that we save some money and replace the AC only because it seemed to him that the furnace was still in great shape and was running fine. He told us that he would have his technicians inspect the furnace thoroughly when they had it apart to install the AC. My husband was at home when the furnace was apart and was very impressed when the tech took him downstairs to personally show him that the furnace was in excellent working condition. He also cleaned the furnace at no extra charge. So now I have an honest heating and AC company that I can highly recommend to other home owners. Great job Thank You!
Jan 1, 2015
I had made the decision to replace my furnace and AC earlier this year. After meeting with several HVAC contractors I decided to go with Dave and his company. Dave was on time, polite, friendly and very professional. He took the time to answer all my questions and to explain the scope of work that would be required to do the job. The technicians arrived on time did a professional installation and completed the job on schedule. They respected my home by putting down vinyl runners to protect my floors and did a very thorough clean up. Im very pleased with my decision to go with Dave and his team. I would highly recommend them to anyone who is considering upgrading their furnace and air conditioner.
Jan 1, 2015
I have no problem in recommending Dave and the TWINTECH team to any home owner who is looking for quality heating and AC products and expert service.
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