What type of furnace filter should I install after construction dust contamination in Ottawa?

Furnace filter selection after construction dust contamination is an important decision, but it sits just outside the core scope of post-construction cleaning advice I can offer here. Choosing the right furnace filter involves HVAC system specifications, airflow ratings, and equipment compatibility — that is really a question for an HVAC technician or your furnace manufacturer rather than a cleaning advisor.

What I Can Tell You About Construction Dust and Your HVAC System

What I can speak to directly is why your HVAC system needs serious attention after any Ottawa construction or renovation project, and what the cleaning side of that equation looks like.

Ottawa's winter construction conditions create an especially severe dust problem for HVAC systems. When indoor humidity drops to 15 to 20 percent during heating season, construction dust — particularly drywall dust and concrete dust — becomes extraordinarily fine and airborne. Your furnace runs constantly during cold months, and that means it is actively pulling this fine particulate through your ductwork and distributing it throughout every room in the home. By the time construction wraps up, your ducts can be heavily coated with a layer of compacted fine dust that no filter change alone will resolve.

Professional duct cleaning is strongly recommended after any major renovation or new build in Ottawa. This is not a DIY task — it requires commercial-grade negative pressure equipment, rotary brush systems, and HEPA filtration to properly extract contamination from the full duct network. For a typical Ottawa home, professional duct cleaning runs $400 to $800, and it should be completed before you install any new filter, because running the system through dirty ducts defeats the purpose of a clean filter entirely.

For specific filter recommendations — MERV ratings, filter thickness, compatibility with your specific furnace model — I would encourage you to contact an HVAC contractor directly. If you need help finding one in the Ottawa area, the Ottawa Construction Network directory at justynrookcontracting.com lists HVAC contractors alongside cleaning and other construction trades. It is a free resource you can browse at your own pace to find someone who can assess your system properly and give you a filter recommendation based on your actual equipment.