Poor Indoor Air Quality & Winter Allergies

Quick answer: Yes. In winter, homes stay closed up with windows shut and the furnace running constantly, which recirculates dust, pet dander, dust mites, and mold spores instead of flushing them outside. Without good filtration and some fresh air exchange, indoor allergen levels can build up and trigger year-round allergy symptoms even when outdoor pollen isn't a factor.

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Why Winter Air Quality Affects Allergies

During Metro Vancouver's cooler, wetter months, most homeowners keep windows and doors closed and run the furnace or heat pump much more often. That reduces natural air exchange with the outdoors, so whatever is already in the house — dust, pet dander, dust mite debris, mold spores from damp areas, and even off-gassing from cleaning products — stays in circulation and gets pushed through the ductwork repeatedly.

Higher indoor humidity from cooking, showers, and reduced ventilation can also encourage mold and dust mites, both common winter allergy triggers. If your furnace filter is old, clogged, or too low a MERV rating to catch fine particles, it isn't doing much to remove these irritants from the air stream.

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What Actually Helps

Replace your furnace filter regularly, and consider a higher MERV-rated filter (check your furnace manual first — some older systems can't handle a MERV rating that's too restrictive without airflow problems)
Vacuum and dust regularly using a vacuum with a good filter, focusing on carpets, bedding, and upholstery where dander and dust mites accumulate
Keep indoor humidity in a moderate range — overly damp air encourages mold and dust mites, while overly dry air can irritate sinuses
Have ducts inspected if you notice visible dust buildup at vents or haven't had them checked in several years
Consider a whole-home air filtration upgrade or an HRV/ERV system if your home is tightly sealed and doesn't get much natural fresh air exchange

When to Call a Professional

If you've tried basic filter and cleaning changes and allergy symptoms are still noticeably worse indoors than outdoors, it's worth having an HVAC technician take a look. We can inspect your ductwork, check whether your system can support a better filter without hurting airflow, and talk through options like enhanced filtration or ventilation upgrades suited to your home. Call CANRO Heating & Cooling at (604) 359-1081 or email info@canroheat.ca to book a visit.

Frequently asked questions

Does running the furnace fan more often help with allergies?

Running the fan continuously (rather than only when heating) can help by pulling more air through the filter more often, but only if the filter itself is clean and rated to actually capture fine allergens. A dirty or low-grade filter won't help much no matter how often the fan runs.

What MERV rating is best for allergies?

Many homeowners see improvement with a MERV 11-13 filter, which captures finer particles like pet dander and mold spores better than a basic MERV 8 filter. Always confirm with a technician that your specific furnace can handle the added airflow resistance first.

Can dry winter air make allergy symptoms worse too?

Yes, dry air from constant heating can irritate nasal passages and make you more sensitive to airborne irritants, even if it isn't a true allergen itself. A humidifier can help balance this in very dry homes.

Is duct cleaning worth it for allergy relief?

If your ducts have visible dust buildup, pet hair, or haven't been cleaned in many years, duct cleaning can meaningfully reduce recirculated allergens. It's not something that typically needs to be done every year, though.

Do air purifiers help more than furnace filters?

A quality furnace filter treats all the air moving through your ductwork, while a standalone air purifier only treats the room it's in. Many homes benefit most from a good furnace filter plus a purifier in a bedroom or main living space.

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Reviewed by the CANRO Heating & Cooling service team — July 07, 2026. Technical Safety BC gas licence LGA0043870 · boiler licence LBP0046450 · Red Seal certified · WorkSafeBC and liability insured · 4.9★ from 85+ Google reviews · serving Metro Vancouver since 1999 · (604) 359-1081.

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Frequently asked questions

What HVAC services does CANRO offer in Metro Vancouver?

CANRO installs, services and repairs boilers, furnaces, heat pumps, hot water tanks, tankless water heaters, gas fireplaces and air conditioning across Metro Vancouver. We work on residential homes, townhouses and condos throughout the Lower Mainland.

How long has CANRO been in business?

CANRO has been serving the Greater Vancouver area since 1999. Our founder George is recognised by customers as one of the most experienced boiler and hydronic heating technicians in the Lower Mainland.

What areas do you serve?

We cover all of Metro Vancouver: Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Delta, Langley, Port Moody, Port Coquitlam, White Rock, Pitt Meadows, and Maple Ridge.

Are CANRO technicians licensed and insured?

Yes. CANRO holds Technical Safety BC contractor licences for gas (LGA0043870) and boilers (LBP0046450), our technicians are Red Seal certified for HVAC and gas, and we carry full liability insurance and WorkSafeBC coverage.

How can I book a service call?

Call (604) 359-1081, email info@canroheat.ca, or use the booking form. Provide the address, equipment and symptoms so CANRO can confirm the service scope and current appointment availability.

Do you offer free estimates?

Yes. Free in-home estimates are provided for boiler, furnace, heat pump and water-heater replacements. Diagnostic visits for repairs carry a flat service fee that is credited toward the repair if you proceed.

What brands do you service?

We service all major brands including Viessmann, Navien, IBC, Rinnai, Rheem, Bradford White, Weil-McLain, Laars, Baxi, NTI, Lennox, Carrier, Bryant, Goodman, Trane, York, Daikin, Mitsubishi Electric, AO Smith, Bosch, Noritz, Giant, GSW, John Wood, and Valor.

Do you offer government rebates for heat pumps?

A qualifying heat-pump project may be eligible under current BC programs. Check the program requirements, equipment and any required pre-approval before installation. The Canada Greener Homes Grant and Loan are closed to new applications. The program administrator determines eligibility and funding.

How quickly can you replace a broken hot water tank?

Contact CANRO with the equipment details and whether there is active leaking or no hot water. Timing depends on assessment, equipment availability, access and the required work; confirm scheduling when booking.

Why should I choose CANRO over other HVAC companies?

CANRO has been operating in Metro Vancouver since 1999 with a 4.9-star rating from 85+ Google reviews. We specialise in difficult boiler systems (Viessmann, IBC, Baxi, Laars) that many companies do not service, we give honest options instead of upselling, and our work is performed by long-term staff — not subcontractors.

Reviews

What Metro Vancouver homeowners say

4.9

★★★★★

85+ verified Google reviews

“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”

Nadia NaderiGoogle review

“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”

Arlene ColasurdoGoogle review

“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”

B. NiekGoogle review

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Can Poor Indoor Air Quality Make Allergies Worse in Winter?

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Why Winter Air Quality Affects Allergies

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What Actually Helps

When to Call a Professional

Frequently asked questions

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Frequently asked questions

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