Central Heat Pump ARCOAIRE HSH4 Premium | 3.5 Tons - 42,000 BTU (Air Handler FJMA4X) - R410A
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Replace the old furnace with a system that heats and cools the whole house
When the furnace in a home with ductwork reaches the end of its life, there is no need to replace it with a unit that only heats. The Central Heat Pump ARCOAIRE HSH4 Premium | 3.5 Tons - 42,000 BTU (Air Handler FJMA4X) - R410A pairs the HSH442GKA outdoor unit with the FJMA4X42L0BB indoor unit, an air handler that takes the place of the old furnace and pushes air through the existing duct system. The same system provides cooling in summer and most of the heating in winter.
This pairing from Arcoaire's Premium range is offered while supplies last. The 3.5-ton size is aimed at homes whose load calculation falls between the 3-ton and 4-ton sizes.
What the air handler does
In a central system, the indoor unit does three things. It carries the indoor coil, where the refrigerant releases its heat in winter and captures it in summer. It houses the blower that pushes air through the ducts to each room and draws it back through the return grilles. And it holds the filter, which protects both the coil and the home's air quality.
The FJMA4X42L0BB unit is the "air handler" named in the product title. In most homes, we install it where the old furnace stood, in the basement or a mechanical room, and connect it to the existing supply plenum and air return. Fittings are adapted on site so the duct system stays airtight.
A home that keeps its ducts
The main advantage of a central system is that it reuses a duct system that is already in place. No wall units in the rooms, no refrigerant lines running along the outside walls of each bedroom: warm or cool air comes out of the same registers as before. For a home where you want to keep the walls clear, it is often the most discreet option.
The duct system still has to be able to do its job. Undersized ducts, return air openings that are too small or crushed sections limit airflow, and a central heat pump is more sensitive to this than a furnace. We inspect the duct system before the quote and list any corrections needed. If the ducts have never been cleaned, replacing the unit is a good time to do it.
Homes suited to the 3.5-ton size
This size typically suits a single-storey home with a large open area and a finished basement, a mid-sized cottage with three bedrooms upstairs, or an older home enlarged over the years whose furnace serves every room. These are typical examples, not rules.
The size is always confirmed by a load calculation. Attic insulation, the condition of the windows, the share of below-grade walls and sun exposure change the result from one home to the next. We do this calculation during the visit, room by room, and recommend another size if this one does not fit.
Backup heat for deep cold
This pairing is a conventional central heat pump; it is not listed as a cold-climate heat pump. The lower the outdoor temperature, the lower its heating capacity. During deep cold, the backup heat takes over.
In an all-electric installation, the backup comes from heating elements housed in the air handler. They only come on when the heat pump can no longer hold the setpoint, and they briefly warm the air during defrost cycles. We choose the capacity of this backup according to the load calculation and the capacity of the electrical panel, and we list it in the quote.
A thermostat set up for a heat pump
A central heat pump is controlled a little differently from a furnace. The thermostat must be compatible with a heat pump and its backup: it runs the outdoor unit first, then only calls on the elements when the house really needs them. We configure it during commissioning.
A practical tip: avoid large nighttime temperature setbacks in the middle of winter. In the morning, to recover several degrees at once, the thermostat calls on the backup longer than necessary. A steady setpoint, or a modest setback, lets the heat pump do most of the work.
The outdoor unit in winter
The HSH442GKA outdoor unit works outside all winter. When frost forms on its coil, it switches to defrost mode for a few minutes: a cloud of white vapour may then rise from it, which is normal. Meltwater must be able to drain freely under the unit, without forming ice that builds back up toward the coil.
That is why we install it on a stand, above the snow line, away from gutters and snow sliding off the roof. The location also takes into account bedroom windows, the neighbours and access for maintenance.
Cooling through the same duct system
In summer, the cycle reverses: the indoor unit's coil captures heat from the air in the house and the outdoor unit releases it outside. Cool air travels through the same ducts as the heat in winter, up to the upstairs bedrooms and down to the basement.
The coil removes moisture from the air at the same time. Condensed water flows through the indoor unit's condensate drain to a discharge point, and the house becomes comfortable without having to lower the setpoint excessively. For homes whose upper floor stays warm in July, we check the balance of the duct system and the position of the returns.
System ratings
The pairing of the HSH442GKA outdoor unit and the FJMA4X42L0BB indoor unit is not listed with SEER2 ratings in the AHRI certification directory. We therefore publish no efficiency rating for this pairing. We confirm the ratings of the complete system before the quote; they also determine grant eligibility.
LogisVert
This pairing does not carry an amount on Hydro-Québec's LogisVert list of October 19, 2026. If the grant matters for your project, we will point you to an eligible pairing of comparable size. We compare the options with you during the visit, before the quote.
Installation in a ducted home
The indoor unit takes the place of the old furnace or air handler and connects to the existing duct system. Before the quote, we check duct sizes and the air return, because a central heat pump only delivers its full efficiency if the airflow keeps up. The outdoor unit goes on a stand, above the snow line, on a dedicated circuit.
How we proceed
- Free in-home assessment: load calculation, inspection of the ducts and air return, choice of the outdoor unit location.
- Written quote: size, backup heat, duct work and electrical connection are all listed.
- Removal of the old unit and installation of the air handler, connected to the plenum and the return.
- Refrigerant line set insulated, evacuated and checked before the refrigerant is released, then condensate drain connected.
- Electrical connection on a dedicated circuit, after checking the panel's capacity.
- Commissioning: charge, temperatures, airflow, thermostat, then an explanation of the settings.
Maintenance: the filter first
Replace the system filter according to its format, keep the outdoor unit clear of snow and leaves, and plan annual HVAC maintenance of the coil, condensate drain and electrical connections. A clogged filter is the most common cause of weak airflow: check it every month during the first season, until you know your home's rhythm.
AirGreen, for the life of the installation
A family business active for more than fifteen years in Montreal, Laval, Longueuil, the North Shore and the South Shore, we hold RBQ licences for ventilation, refrigeration and electrical work and carry $5,000,000 in liability insurance. The in-home assessment is free, the quote is in writing, and our financing options let you choose the right unit rather than the cheapest one.
Request your free estimate for the Central Heat Pump ARCOAIRE HSH4 Premium | 3.5 Tons - 42,000 BTU (Air Handler FJMA4X) - R410A. We assess the home room by room and confirm the right size and your grant eligibility before signing.
Offered while supplies last.
Warranty: 10 years on the compressor, 10 years on parts and 6 years on labor.