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Indoor Air Quality · Filtration & UVWhole-Home Air Purifier & UV Installation
A whole-home air purifier is a filter cabinet or an electronic air cleaner built into the ductwork at the furnace, so everything the blower moves gets cleaned rather than only the air near a plug-in box in one room. A UV lamp is a separate job: it sits over the evaporator coil and keeps biological growth off wet metal.
Be clear about what each device does. Filtration captures particles — dust, dander, pollen, smoke — and the higher the MERV rating, the smaller the particle it holds. It does nothing about gases or odours unless there is activated carbon in the media. A UV lamp aimed at the coil and drain pan controls the slime that grows there in cooling season, which is a real and worthwhile job; the claims about sterilizing room air as it whips past a lamp at duct velocity are a lot weaker, and our answer on whether UV lights in HVAC systems work says so plainly.
Static pressure is the constraint nobody mentions in the ads. A one-inch MERV 13 filter is the worst of both worlds: high resistance across very little surface area, which starves the blower, drops airflow to the far rooms and can freeze an evaporator coil. A four- or five-inch media cabinet at the return plenum gives better filtration at lower resistance, because the deep pleats have many times the surface area of a thin filter. We measure static pressure before and after fitting one, rather than assuming. MERV ratings explained covers what the numbers mean, and whether a filter can be too restrictive covers what happens when they are ignored.
The local reasons people call are specific. Houses backing onto the QEW through Aldershot, or onto the 403 and the Lincoln Alexander Parkway in Hamilton, take a steady load of road grit and brake dust through every window and door. Homes in Hamilton's north end and along the Stoney Creek industrial strip get a different mix. Late-summer ragweed and the smoke days that now show up most summers affect everybody. And in the 2000s-and-newer builds around Alton Village and Joshua Creek, the envelope is tight enough that whatever is generated indoors just accumulates — which is why filtration and ventilation belong in the same conversation.
One practical note before you buy: a five-inch cabinet needs room. It adds depth at the return side of the furnace, and in a tight mechanical room the plenum has to be transitioned to make it fit, so we look at the furnace room before quoting rather than after. And if the ducts themselves are loaded with construction dust or years of neglect, a duct cleaning comes first — putting a good filter on filthy ductwork just moves the problem. Ask for a written quote and we will measure what you have.
A whole-home air cleaner earns its keep when
- Someone in the house has asthma or allergies, or dreads ragweed season every August
- Dust settles back on flat surfaces within a day or two of cleaning
- The one-inch filter is grey and sucked concave at the end of a single month
- The evaporator coil or drain pan has visible growth, or the vents smell musty when cooling starts
- You back onto a highway, a rail line or an arterial road and the windowsills prove it
How it works
Static pressure readings at the furnace, a look at the return sizing and the space around the plenum, and an honest read on whether your ductwork can carry higher-MERV media at all.
Media cabinet or electronic cleaner cut into the return with proper transitions and sealed joints; UV lamp mounted where it actually sees the coil, on a serviceable access panel.
The cabinet gets labelled with the media size and the date, so the next filter is a five-minute job instead of a scavenger hunt at a hardware store.
Brands: We fit media cabinets, electronic air cleaners and coil UV lamps chosen to suit your ductwork, and we service the builder-installed cabinets already sitting on most newer furnaces.
Common questions
Will a high-MERV filter damage my furnace?
A thin one can, by choking airflow. A deep media cabinet at the same MERV rating usually reads lower on the manometer than the one-inch filter it replaced. The rule is simple: measure the static pressure, do not guess it.
Media cabinet, electronic cleaner or HEPA bypass?
A four- or five-inch media cabinet is the right answer for most homes — good capture, low resistance, one filter change or two a year. Electronic cleaners capture very fine particles but need washing every few weeks to keep performing. A HEPA bypass filters a portion of the airflow and needs space and its own ducting.
Do UV lamps help with smells?
A coil lamp stops the musty smell that comes from growth on a wet coil, which is a common complaint at the start of cooling season. It will not do anything about cooking or smoke odours — that takes activated carbon, and carbon media needs replacing on a schedule to keep working.
How often does the media get changed?
Deep media typically runs six to twelve months depending on the household — pets, renovations and a busy road all shorten it. A UV lamp gets replaced annually even though it still lights up, because output falls off long before the lamp dies.
Will this fix a dusty house on its own?
It will fix a lot of it, but not leaky return ducts pulling attic and basement dust into the system, and not a house that is under renovation. Why a house stays dusty covers the other causes worth checking first.