{"product_id":"thermopompe-centrale-add-on-arcoaire-h4h5s-ion-3-5-tonnes-42000-btu-serpentin-evd4x-17-5-po-r410a","title":"Central Heat Pump ADD-ON ARCOAIRE H4H5S ION | 3.5 Tons - 42,000 BTU (Coil EVD4X 17.5 in.) - R410A","description":"\u003ch2\u003eAn outdoor unit that works all winter, placed accordingly\u003c\/h2\u003e\u003cp\u003eThe ADD-ON system adds a heat pump to an existing electric furnace: a coil is installed on the furnace and the outdoor unit heats and cools through the same ducts. The furnace's electric elements are only used as backup. The \u003cstrong\u003eCentral Heat Pump ADD-ON ARCOAIRE H4H5S ION | 3.5 Tons - 42,000 BTU (Coil EVD4X 17.5 in.) - R410A\u003c\/strong\u003e pairs the \u003cstrong\u003eH4H5S42AKAAA\u003c\/strong\u003e outdoor unit with the \u003cstrong\u003eEVD4X42M17A\u003c\/strong\u003e coil.\u003c\/p\u003e\u003cp\u003eA central air conditioner spends the winter switched off. A heat pump works outside in cold weather, under snow and freezing rain. The location of the outdoor unit therefore becomes a major decision in the project, just like the choice of size. This page explains how we choose it.\u003c\/p\u003e\u003ch3\u003eWhat happens outside while the house is heating\u003c\/h3\u003e\u003cp\u003eIn heating mode, the outdoor unit captures the heat contained in the outdoor air, even cold air, and the \u003cstrong\u003eR-410A\u003c\/strong\u003e carries it to the coil on the furnace. The outdoor unit's coil then becomes colder than the surrounding air, and the air's moisture settles on it as frost. To clear it, the heat pump runs short defrost cycles: a plume of white vapour rises from the unit, and you may hear a brief whoosh when the reversing valve changes position. Both are normal.\u003c\/p\u003e\u003cp\u003eIn summer, the role reverses: the unit rejects outside the heat removed from the house. In both seasons, it needs open air around it to run normally.\u003c\/p\u003e\u003ch3\u003eAbove the snow, away from ice\u003c\/h3\u003e\u003cp\u003eA unit set on the ground can end up buried after a storm, or blocked by snow sliding off the roof or pushed aside when clearing the driveway. We install it on a stand that keeps it above the usual snow line on your property, taking into account the snowbanks that clearing creates every winter.\u003c\/p\u003e\u003cp\u003eThe stand also deals with water. During defrost, the water draining from the unit must be able to get away. On a raised unit, it falls to the ground and runs off; on a unit at ground level, it can freeze under the equipment and form a block of ice that interferes with its operation. We also avoid placing the unit above a walkway or stairs, where that water would freeze in the path.\u003c\/p\u003e\u003ch3\u003eRoof drip and wind\u003c\/h3\u003e\u003cp\u003eWater falling from a roof without a gutter, or from an overflowing gutter, freezes in layers on the unit and can damage the fins or the fan. We place the unit outside the roof's drip line, or plan protection when the location leaves no other option.\u003c\/p\u003e\u003cp\u003eWind matters too: a corner of the house exposed to prevailing winds collects snow and blows it onto the unit. A sheltered but not enclosed location is preferable. The unit must keep the clearance specified by the manufacturer all around it, with no hedge, fence or shed blocking the airflow.\u003c\/p\u003e\u003ch3\u003eNeighbours, windows and municipal rules\u003c\/h3\u003e\u003cp\u003eA heat pump that runs in winter also runs at night. We avoid placing it under a bedroom window, yours or your neighbour's, or near outdoor sitting areas. The municipalities and boroughs of \u003cstrong\u003eMontreal\u003c\/strong\u003e, \u003cstrong\u003eLaval\u003c\/strong\u003e and \u003cstrong\u003eLongueuil\u003c\/strong\u003e often regulate the location of outdoor equipment: setbacks from property lines, front-yard restrictions, a visual screen in some cases. We check these rules for your address before setting the location.\u003c\/p\u003e\u003ch3\u003eThe 3.5-ton size and the ION series\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003e3.5-ton\u003c\/strong\u003e size often serves a large house on two levels, a two-storey home with a finished basement or an extended semi-detached house on the \u003cstrong\u003eNorth Shore\u003c\/strong\u003e. These examples are only a guide: insulation, windows and airtightness change the load, which we establish with a room-by-room \u003cstrong\u003eload calculation\u003c\/strong\u003e. Because the furnace's electric elements cover the coldest days, the heat pump is sized on cooling, which avoids the short cycles of an oversized unit.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eH4H5S42AKAAA\u003c\/strong\u003e unit is part of Arcoaire's ION series. For this size, the same \u003cstrong\u003eEVD4X42M17A\u003c\/strong\u003e coil goes with several series of outdoor units; the ratings of each pairing are confirmed before the quote.\u003c\/p\u003e\u003ch3\u003eSystem ratings\u003c\/h3\u003e\u003cp\u003eThe pairing of the \u003cstrong\u003eH4H5S42AKAAA\u003c\/strong\u003e outdoor unit and the \u003cstrong\u003eEVD4X42M17A\u003c\/strong\u003e coil is not listed with SEER2 ratings in the AHRI certification directory. We confirm the ratings of the complete system before the quote; they also determine grant eligibility.\u003c\/p\u003e\u003cp\u003eWe give them to you in writing with the quote. No rating is shown on this page, since there is no certificate for this exact pairing.\u003c\/p\u003e\u003ch3\u003eLogisVert\u003c\/h3\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003ch2\u003eInstallation on the existing furnace\u003c\/h2\u003e\u003cp\u003eThe coil sits on the furnace's air outlet, and a compatible thermostat decides when the heat pump heats alone and when the electric furnace takes over. We check the condition of the furnace, the airflow of its blower and the duct sizes before the quote. The outdoor unit goes on a stand, above the snow line, on a \u003cstrong\u003ededicated circuit\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eInside: the 17.5 in. coil and the heat pump thermostat\u003c\/h3\u003e\u003cp\u003eIn the basement, the \u003cstrong\u003eEVD4X42M17A\u003c\/strong\u003e coil sits between the furnace's air outlet and the plenum. Its \u003cstrong\u003e17.5 in.\u003c\/strong\u003e format must match the width of the furnace cabinet; when needed, a sheet-metal transition joins them. The coil has its own \u003cstrong\u003econdensate drain\u003c\/strong\u003e: in summer, it removes humidity from the air in the house, and that water drains to the floor drain or a condensate pump.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eheat pump thermostat\u003c\/strong\u003e decides when the heat pump is enough and when backup is needed. In cool weather, the heat pump works alone; when the cold deepens, the thermostat brings in the furnace's electric elements as \u003cstrong\u003eauxiliary heat\u003c\/strong\u003e, and in deep cold, they take over. The auxiliary heat threshold is set at commissioning, according to the heat loss of the house and your comfort. The heat pump's air is less hot than the air from the electric elements, and its cycles are longer: this is normal.\u003c\/p\u003e\u003ch3\u003eThe line set route\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003erefrigerant line set\u003c\/strong\u003e connects the outdoor unit to the coil. It passes through the wall via an opening that we seal against air and water, then runs to the furnace by the most direct and tidy route possible. The suction line is insulated along its entire length to prevent condensation in summer and losses in winter. Outside, a line cover protects the line set from sun and impacts when the location calls for it.\u003c\/p\u003e\u003cp\u003eThe joints are brazed under nitrogen, then the line set undergoes a pressure test and a vacuum before the refrigerant charge.\u003c\/p\u003e\u003ch3\u003eElectrical: dedicated circuit and disconnect\u003c\/h3\u003e\u003cp\u003eThe outdoor unit is fed by a \u003cstrong\u003ededicated circuit\u003c\/strong\u003e from the electrical panel. An outdoor disconnect, installed within sight of the unit, lets it be de-energized for maintenance. Before the quote, we check that the panel has the required space and capacity, taking into account the electric furnace that stays connected for backup; if a modification is needed, the quote spells it out. A control cable also connects the outdoor unit to the furnace and the thermostat.\u003c\/p\u003e\u003ch3\u003eMaintenance\u003c\/h3\u003e\u003cp\u003eReplace the system filter according to its format, keep the outdoor unit clear of snow and leaves, and plan annual \u003cstrong\u003eHVAC maintenance\u003c\/strong\u003e of the coil, condensate drain and electrical connections. In winter, white vapour during defrost is normal.\u003c\/p\u003e\u003cp\u003eAfter a storm, clear the snow around and on top of the unit by hand or with a broom, without an ice pick or metal shovel that could damage the fins. Do not cover the unit for the winter: it must be able to run at all times.\u003c\/p\u003e\u003ch3\u003eAirGreen, for the life of the installation\u003c\/h3\u003e\u003cp\u003eA family business active for more than fifteen years in \u003cstrong\u003eMontreal\u003c\/strong\u003e, \u003cstrong\u003eLaval\u003c\/strong\u003e, \u003cstrong\u003eLongueuil\u003c\/strong\u003e, the \u003cstrong\u003eNorth Shore\u003c\/strong\u003e and the \u003cstrong\u003eSouth Shore\u003c\/strong\u003e, we hold RBQ licences for ventilation, refrigeration and electrical work and carry \u003cstrong\u003e$5,000,000\u003c\/strong\u003e in liability insurance. The in-home assessment is free, the quote is in writing, and our \u003ca href=\"\/en\/pages\/financement-avec-financeit\"\u003efinancing options\u003c\/a\u003e let you choose the right unit rather than the cheapest one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRequest your free estimate for the Central Heat Pump ADD-ON ARCOAIRE H4H5S ION | 3.5 Tons - 42,000 BTU (Coil EVD4X 17.5 in.) - R410A. We assess the home room by room and confirm the right size and your grant eligibility before signing.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAvailable while supplies last.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e 10 years on the compressor, 10 years on parts and 6 years on labor.\u003c\/p\u003e","brand":"Arcoaire","offers":[{"title":"Default Title","offer_id":67799193288996,"sku":"H4H5S42AKAAA","price":0.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0715\/1694\/6724\/files\/THERMOPOMPE_CENTRALE_ADD_ON_ARCOAIRE_H4H5S_3_5_TONNES_42000_BTU_R410A_00_MONTREAL_LAVAL_LONGUEUIL_RIVE_SUD.png?v=1793082528","url":"https:\/\/airgreen.ca\/en\/products\/thermopompe-centrale-add-on-arcoaire-h4h5s-ion-3-5-tonnes-42000-btu-serpentin-evd4x-17-5-po-r410a","provider":"AirGreen Climatisation \u0026 Chauffage \/ Air Conditioning \u0026 Heating","version":"1.0","type":"link"}