furnace filter calgary

Finding the Right Furnace Filter

When you walk into the furnace filter aisle in a hardware store, it can be overwhelming to look at all the options available. From the size of the filter and impurities you want to remove, to the price and name brand, there are a lot of things to consider before you head to the check-out aisle. We asked the experts to weigh in on furnace filter selection, and here’s what they had to say.

Size of the filter matters

Yes, different furnaces require different filter sizes, so it’s important that you select the right size for your furnace. Furnace filters are sized by width, length, and thickness. The easiest way to tell is to check the dimensions on the filter that is currently in the furnace before you go shopping.

Alternatively, the owner’s manual for your furnace should tell you what size you need. If you can’t find the manual, you can always google your make and model.

Read the ratings

Different filters have what’s called a “microparticle rating”. The higher the rating number, the smaller particles can be removed from the air. A basic filter will be a 300 microparticle rating and will remove dust and lint. A midrange filter, at 600 microparticles, will also capture dust mite debris and mold spores. Allergy-rated filters (rated around 1,000 microparticles) will help with pet dander, pollen, and smoke. And the high-end filters, at 1,500 microparticles, can remove bacteria viruses and odors, and maximize the air quality. Naturally, the price goes up when the rating does.

You may be surprised to learn that many professional furnace cleaning companies will recommend a basic filter for most furnaces, as long as it is replaced on a monthly basis!

The reason is that thicker filters with higher ratings tend to clog more quickly, making the furnace work harder, causing a reduction in efficiency and prematurely wearing out parts. The good news is that basic Fibreglass type filters are available at a fraction of the cost, come in bulk quantities and there are several non-brand name options, so it can actually be cheaper to use these filters even with the increased replacement frequency.

It is worth considering higher-end filters if you have allergies, pets, or an older home with mold or mildew issues.

Out with the old

When it comes to keeping your furnace running optimally and your air clean, regular filter replacement is essential. Changing your filter helps keep your system working more efficiently and for longer. And a more effective system means less need for furnace repairs or furnace replacement. Basic filters should be changed monthly. Many of the higher-end filters recommend changing every 90 days. If you have pets, a dusty environment, or have just had renovation work done, check your filter more frequently.

Some other signs that it is time to change your filter include:

  • Energy bills creeping up
  • Increased sickness or allergy symptoms
  • More dust in the air (or collecting on countertops, floor, and furniture)
  • It takes longer to heat your home (due to the short cycling furnace)
  • When in doubt, it’s good to replace the filter

Spend wisely

A top-end filter can cost as much as $50/filter. It will last longer, and also provide better filtration. But as we mentioned, for most homes, a basic filter will do just fine. In most cases, you can save money by purchasing a pack of 3 filters versus buying a single filter.

Generic is okay

While there are several different sizes and ratings, there are a number of different brands available on the market. And while you may be sucked in by a brand, what really matters in the end, is the performance, not the logo.

To read more about furnaces in our Homeowner’s Furnace Guide, click here.


New call-to-action

Subscribe and stay up to date with the newest posts delivered right to your inbox!

Quote guarantee

When we receive an online furnace or air conditioning quote request and the customer accepts the initial quote, we’ll send a comfort advisor to confirm the provided information and quoted price in person. 


If the comfort advisor finds any inaccuracies during the in person visit, we’ll revise the quoted price on the spot. After the quoted price is confirmed with an in person visit, the price is set. 


If there are unforeseen complications on the date of install, Advanpro will not pass the additional costs along to the customer. (See exceptions in Terms below.)



The guarantee is not valid if the customer provides inaccurate information when Advanpro seeks to confirm any information about the quote. This also applies to the on-site confirmation visit. 


In the exceptional circumstance that the chimney liner required for most furnace installations cannot be installed or gets stuck during installation, the guarantee no longer applies and we will provide a supplementary quote to complete installation. 

Repair guarantee

If the diagnosed issue is not fixed by our initial repair, we will dispatch the first available service technician to return and fix it at no additional cost.


If we determine that there is an additional unrelated issue, there may be a charge for the additional repair.

Correct A/C sizing guarantee

If the air conditioner Advanpro installs is determined to be improperly sized for your home, we will supply and install the correctly-sized A/C condenser at no additional cost. 


Advanpro must be immediately notified of any install issues. The guarantee applies for 3 months, starting from the installation date. The guarantee no longer applies if, at any time after the quote or installation, modifications are made to the home that impact cooling requirements.

Correct furnace sizing guarantee

If the furnace Advanpro installs is determined to be undersized for your home, we will supply and install the correctly-sized furnace at no additional cost. 


Advanpro must be immediately notified of any install issues. The guarantee applies for 3 months, starting from the installation date. The guarantee no longer applies if, at any time after the quote or installation, modifications are made to the home that impact heating requirements.

A/C Tune Up

Regular preventative maintenance improves efficiency and extends the lifespan of your air conditioning system, with the following benefits:


  • Reduced electricity bills and operating costs. When the unit operates as designed, electricity usage is reduced.
  • Maximized cooling capacity. Home comfort on the hottest of days with minimum run time.
  • Minimized repair bills. Detect and fix small problems before they get worse.

HRV Cleaning

Most homes built in the last few years have a Heat Recovery Ventilator (HRV), which efficiently replaces stale indoor air with fresh outdoor air, all year round.


As with any other air-handling equipment in your home, your HRV should be cleaned regularly to ensure the best possible indoor air quality.


If you aren’t sure if you have an HRV, call our team to find out how you can tell.

Duct Work Sanitizing

If you or your loved ones suffer from respiratory issues or allergies, or you’re concerned about the quality of the air that you are breathing, then our sanitizing treatment will give you the reassurance that your ductwork is sterile and free of debris that could negatively impact your respiratory and overall health.


Microban is our hospital-grade sanitizing solution, which kills 99.99% of germs, viruses, funguses, molds, and other pathogens.


We also offer Benefect, an all-natural sanitizer made from plant extracts, which also kills 99.99% of germs, viruses, funguses, and molds. ​

Exhaust Flu Stack Cleaning

Mid-efficiency furnaces produce a sand-like, mildly-corrosive byproduct. This substance condenses in the exhaust flu stack and collects over time near the inducer/venter motor, restricting exhaust gas flow. Eventually, it enters the inducer motor and causes premature wear on the furnace.


Exhaust flu stack cleaning removes the build-up to reduce the chance of motor failure and maximize the life span of your furnace. Preventative maintenance ensures your furnace runs efficiently all Winter long — without costly no-heat emergencies. 

A/C + High-efficiency Bypass

The secondary heat exchanger in a high-efficiency furnace or A/C coil has delicate, closely spaced fins that must be protected during your furnace and duct cleaning.


For furnaces that require a bypass, we temporarily install a filter above the heat exchanger or A/C coil, and position our duct vacuum above the filter.


This bypass procedure prevents damage by ensuring all dust and debris in your supply duct work is collected before reaching the heat exchanger or A/C coil.


Standard furnaces without A/C don’t have secondary heat exchangers or A/C coils and don’t require the bypass procedure.

Furnace Tune Up

Regular furnace tune ups are essential to maximizing the lifespan and efficiency of your furnace, so you can rely on it to keep you warm all Winter long.​


During our 30+ point inspection, we check all furnace systems to identify components that are worn out and need replacement. Replacing parts before they break — preventative maintenance — maximizes heating efficiency, avoids no-heat emergencies, and saves on costly service calls. 


Home furnaces can last for 20 years or more if well-maintained. A professional furnace tune up every two years helps to preserve your investment for decades.

Reverse Octopus Whip Tool

The reverse octopus whip has eight 16” flexible tentacles, which whip around blasting high-pressure air in all directions as it moves through your duct work.


The tool agitates and dislodges the most hard-to-reach dust, debris, and contaminants, moving them toward our duct vacuum for collection and disposal.

Brush Cleaning Method

Our high-speed rotary brushing equipment sweeps the entire interior surface of your duct work, ensuring that all dust, debris, and pet hair are vacuumed away.


Physically cleaning the entire length of your duct work ensures that no contaminants are left behind, increasing your indoor air quality and peace of mind.

Dryer Vent Cleaning

Dryer fires are a top-five cause of house fires. Cleaning your dryer vent regularly greatly reduces the chance of a dryer fire, plus the following benefits:


  • Reduces clothes drying times
  • Lowers utility bills through greater efficiency
  • Extends the life span of your dryer
  • Lessens the amount of allergens in your house

Back Skipper Tool

The back skipper is a 1” diameter rounded ball connected to a long, flexible high-pressure airline.


The 1” ball has jets that discharge high-pressure air, pulling the tool and airline through the length of your duct work.


The high-pressure air moves the dust and debris toward our duct vacuum, where it is collected for disposal.​