In short
An air handler is the indoor unit of a heat pump or all-electric system: a cabinet holding the blower, the refrigerant coil and usually electric heat strips. It does the furnace's air-moving job without burning fuel. On a quote, compare the heat-strip size in kW, the blower type and whether it is matched to the outdoor unit; the strips may need added panel capacity.
Homes with no gas line still need something in the basement to move air through the ducts. What is an air handler? It is that something: a tall insulated cabinet, about the footprint of a furnace, connected to the return and supply ducts and to the outdoor heat pump by two copper lines. Inside there is no burner, no gas valve and no vent pipe.
What an air handler does and what is inside it
- Blower: a fan and motor that pull air from the return ducts and push it through the supply ducts. Better models use a variable-speed ECM motor.
- Indoor coil: the refrigerant coil that cools and dehumidifies in summer and, with a heat pump, heats in winter.
- Electric heat strips: resistance elements downstream of the coil that provide auxiliary heat in deep cold and during defrost.
- Controls, a filter slot, and a condensate drain pan with a line to a floor drain or pump.
Three indoor arrangements get confused on quotes. An air handler is all-electric and pairs with a heat pump. A furnace with a coil on top paired with a heat pump is a hybrid, or dual-fuel, system, where gas is the backup. A condo fan coil is a smaller cousin, usually fed by the building's hot and chilled water instead of refrigerant.
Why air handlers show up on quotes in rural Flamborough and Caledon
Natural gas mains do not reach every road. On rural lots in Flamborough, Caledon, Kilbride or Campbellville the existing heat is often propane, oil or electric, and a heat pump with an air handler replaces all of it with one system. The same package is quoted for houses in town whose owners are dropping gas. In both cases the air handler is the indoor half of the heat pump quote, selected as a matched pair with the outdoor unit.
The electrical side needs attention early. A 10 kW strip draws about 42 amps at 240 volts on its own breaker, in addition to the heat pump's circuit. Older 100-amp services may not have the room, so the quote should say whether a panel or service upgrade is included. That work is done by a licensed electrical contractor and filed with the Electrical Safety Authority (ESA); our post on electrical panel upgrades for heat pumps explains the load calculation.
What to compare on an air handler quote, and how they fail
- Heat-strip size in kW: it should come from the heat-loss calculation and the heat pump's cold-weather capacity, not a default. Oversized strips cost panel space; undersized ones leave the house cold in a January cold snap.
- Blower type: variable-speed costs more and gives quieter operation, better humidity control and compatibility with inverter outdoor units.
- Match: the model number should appear with the outdoor unit as a rated combination, for the correct refrigerant.
- Strip staging: larger strip packs should be wired in stages so the whole bank does not come on for a small shortfall.
Failures mirror the blower side of a furnace: a blower motor or its capacitor, a control board, a heat-strip sequencer or relay, and a plugged drain pan that overflows in cooling season. A burnt-out strip element shows up as a house that cannot keep up only on the coldest nights.
What an air handler costs and what to do next
An air handler is normally priced inside the heat pump package: ducted cold-climate heat pump systems run roughly $6,000–$16,000 installed before rebates, depending on capacity, brand tier and the electrical work needed. Replacing only a failed air handler under an existing heat pump is quoted in writing once we confirm what matches the outdoor unit; see air handler replacement. For a new system, start with heat pump installation or book a visit through the contact page.
Questions people ask about Air handler
Is an air handler the same as a furnace?
No. Both move air through the ducts, but a furnace makes heat by burning gas or propane and needs a vent and a gas line, while an air handler has no combustion at all. Its heat comes from the heat pump's refrigerant coil and from electric strips. An electric furnace is essentially an air handler with large strips and no coil.
Can I add an air handler to my existing ductwork?
Usually, yes. An air handler connects to the same supply and return trunks a furnace used. The ducts need to be checked for size, because a heat pump moves more air at a lower temperature than a gas furnace, and restrictive returns that a furnace tolerated will hurt heat pump performance. A static pressure test answers the question.
Does an air handler need maintenance?
Yes: a filter change on schedule, plus a yearly check of the blower, the coil, the drain pan and line, the strip elements and their electrical connections. High-amp connections on heat strips loosen with repeated heating and cooling, and a loose lug overheats. The visit is usually combined with maintenance on the outdoor heat pump.