Your ducts can be spotless and your system still chokes if the blower wheel is caked and the evaporator coil is matted with dust. The blower is the lungs of the system: a dirty wheel moves measurably less air while drawing more power. The A/C coil above the furnace is a dust filter you never see — when it mats over, cooling performance drops and the coil can ice up.
We pull and clean the blower wheel when buildup warrants it, clean the accessible side of the evaporator coil, vacuum the cabinet and burner compartment area, and check your filter setup — most Guelph homes we visit are running a filter that's either too restrictive for the blower or doing almost nothing.
No — a tune-up is combustion testing, gas pressures and safeties, done by a licensed gas tech. We handle the airflow side: blower, coil, cabinet, filter. Ideally you do both.
For most systems: MERV 8–11 changed every 2–3 months; MERV 13 if allergies matter and your blower can handle the restriction. The 'best' filter is the one that matches your system's static-pressure tolerance.
Weak airflow at vents with a clean filter, rising energy use, or a visible fuzz layer on the wheel blades (we photograph it for you). Homes that ran years without good filtration almost always have buildup.
Yes — a matted coil restricts airflow until the coil temperature drops below freezing, ices over, and stops cooling entirely. A coil cleaning is much cheaper than the service call after it ices.