Fall Maintenance Checklist

Originally published December 4, 2023 · Fully updated August 11, 2026

Ottawa can move from warm afternoons to chilly nights quickly in late summer. This fall HVAC maintenance checklist helps you test the complete comfort system—not just the furnace—while there is still time to correct a filter, control, airflow or ventilation issue before heating becomes essential.

A 15-Minute Fall HVAC Check for Ottawa Homeowners

Start with the items you can inspect safely. Do not remove furnace panels, open electrical compartments or attempt to adjust gas or refrigerant components.

• Run a controlled heating testSwitch the thermostat to heat and raise the setpoint slightly. Give the system time to begin its normal sequence.
• Inspect the HVAC filterReplace a dirty filter with the correct size and install it in the airflow direction shown on the frame.
• Open vents and returnsMake sure furniture, rugs and stored items are not restricting supply registers or return-air grilles.
• Clear the outdoor heat pumpRemove leaves and vegetation while maintaining the clearances required by the manufacturer. Do not cover the unit.
• Check the HRV or ERVInspect filters, exterior hoods and the condensate drain according to the equipment manual.
• Test safety alarmsConfirm that smoke and carbon monoxide alarms are powered, within their service life and working properly.

Test the Furnace Before You Depend on It

A thermostat test confirms that the furnace started and produced heat, but it does not assess combustion, venting, electrical components, airflow or safety controls. Professional maintenance can review ignition and burner operation, accessible safety components, blower performance, venting, drainage and filtration as applicable to the equipment.

Book a furnace tune-up in Ottawa while the equipment is operating. A furnace that will not start, repeatedly locks out or develops a new noise or odour needs diagnosis instead. Our guide to the three furnace service checks before winter explains what a meaningful visit should cover.

Let a Hybrid Heat Pump System Change Modes Properly

In a hybrid system, the heat pump usually handles milder conditions and the furnace provides backup or takes over when the controls call for it. There is no universal changeover temperature. Equipment capacity, energy costs, thermostat configuration and home heat loss all affect the strategy.

Select heating and let the system respond without repeatedly changing the setpoint or mode. Keep the outdoor unit unobstructed and able to drain. Steam during a defrost cycle can be normal; heavy ice that does not clear, fault messages or unusual grinding are not.

Do not shut off or cover the heat pump because the furnace has started. Proper controls coordinate both heat sources. Arrange an assessment if the heat pump never starts, the furnace runs continually in mild weather or the home cannot maintain temperature. You can also compare AirZone’s cold-climate and hybrid heat pump options.

Prepare the HRV or ERV for Closed-Window Season

When windows stay closed, controlled ventilation helps remove stale air and manage moisture. Inspect HRV or ERV filters, clear the outdoor intake and exhaust hoods, and check the drain. Follow the manual for recovery-core cleaning because care differs by model.

Window condensation can indicate excess indoor moisture, but the solution is not always more ventilation. Occupancy, cooking, showers, basement moisture, humidifier settings and outdoor temperature also matter. AirZone provides HRV and ERV maintenance, repair and airflow balancing for units that are noisy, leaking, frosting excessively or moving air poorly.

Look Beyond the HVAC Equipment

A maintained heating system still has to overcome building heat loss. Complete these related fall checks:

• Windows and doors: Replace damaged weather-stripping and seal appropriate frame leaks without blocking HVAC or combustion-air openings.
• Attic insulation: Look for gaps, disturbance or moisture. Do not compress insulation or block soffit ventilation.
• Fireplaces and chimneys: Arrange the appropriate inspection and cleaning before use. This work is separate from a furnace tune-up unless specifically booked.
• Vulnerable plumbing: Disconnect outdoor hoses and address pipes that have frozen previously.
• Exterior terminations: Keep furnace vents, dryer exhausts, bathroom exhausts and HRV or ERV hoods clear of leaves and snow.

Choose the Correct Appointment

Maintenance cannot prevent every future component failure, particularly on older equipment. It does provide an opportunity to identify visible or measurable concerns, document system condition and deal with small issues before the first extended cold period.

Ottawa Fall HVAC Checklist FAQs