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Furnace Service & Maintenance

To increase the life and efficiency of your furnace, follow these simple furnace maintenance tips.

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Furnace Service & MaintenanceWhen winter is in full swing, chances are your heating system is working hard to keep your home warm. But during the busy holidays, you may have forgotten to service your furnace.

It’s not too late. Having your furnace checked now will ensure it runs safely and efficiently the rest of the chilly season. You can take care of some furnace maintenance yourself.

Most jobs, including an annual tune-up, are best left to specialists trained to service furnaces. A professional inspection should cover all the parts of your furnace.

The following tasks  included in a service call.

  • Oiling the blower axle on an older belt-driven furnace. Today’s blowers have direct-drive motors that don’t need to be lubricated.
  • Cleaning soot out of the burner and heat exchanger. Residue buildup reduces your furnace’s efficiency.
  • Inspecting the blower blades.
  • Setting the flow of gas, and adjusting the flame’s size and color.
  • Changing the fuel filter in an oil-fired system.
  • Checking the heat exchanger for cracks. The furnace may have to be taken apart to do this correctly.
  • Checking a heat pump’s compressor, fan, and refrigerant pressure.
  • Cleaning a heat pump’s indoor and outdoor coils.

Also replace or clean the furnace filter–in most cases, once a month. Exactly how often, however, depends on your filter type and whether your furnace runs continuously. And if you have an in-duct humidifier, clean its reservoir with white vinegar and regularly treat the water with chlorine tablets to control mildew.

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Should you have any further questions, feel free to contact us by phone or complete the form below to schedule a service appointment.

  • Please fill out the form below in order to schedule service and be sure that your request will be processed promptly and you will hear back from us shortly.

Service Area

DeMark Home Ontario servicing area for HVAC-furnaces, air conditioners, heat pumps, hot water heaters, tankless units includes: Toronto, GTA, Vaughan, Mississauga, Brampton, Markham, Scarborough, Milton, Burlington, Niagara Falls, Oshawa, Pickering, Ajax, Aurora, Newmarket, Barrie and more. For a full servicing area please click here.


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Upgrading to a high-efficiency heating and cooling system offers more than energy savings.

Take advantage of these rebates today!


This item comes with absolutely free standard installation. We’ll ensure that the product is completely installed to code and fully functioning prior to leaving.


Great news! Receive a brand new digital thermostat absolutely free when renting this HVAC product from DeMark Home Ontario.


Great news! When renting a furnace or air conditioner, you’ll get your first 2 months absolutely rent free.


Great news! When renting a furnace and air conditioner together, you’ll get your first 3 months absolutely rent free.


This product carries a manufacturer warranty and we’re happy to explain it in full to you. Feel free to get in touch with us for more information or see the Warranty Information tab for more information


If your order is placed and confirmed by 11am, we can have your HVAC product installed within the same day.

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This water heater is subject to reduced rental rates based on the DHO discount program. Save money on your bill every single month!

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Save money on this item when buying it along with a qualifying high-efficiency furnace or air conditioner.

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Great news! When renting a qualifying water heater, you’ll get your first 2 months absolutely rent free.


Promotional code can be found on the eFlyer, Brochure or promotional email that you received from us.

*If you are an existing customer please refer to the mail or email that was sent to you after the installation of your equipment as it contains your promotional code. If you are having troubles locating it please call us and one of our Customer Service Representatives will be happy to assist you.

  • Please fill out the form below in order to schedule service and be sure that your request will be processed promptly and you will hear back from us shortly.

Notice for Power Vent Water Heater Customers

Effective August 2007, gas code requires technicians working on venting to replace black ABS vent pipe with white UL-certified vent pipe.

We will upgrade your venting pipes at no additional cost.

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