Quick answer
Yes. A heat pump is a central air conditioner with a reversing valve, so in summer it cools and dehumidifies exactly the way an AC does, using the same ducts and the same refrigeration cycle. Cold-climate models with variable-speed compressors typically cool more evenly than a single-stage AC because they run longer at low speed, which pulls more moisture out of humid lakeshore air.
If you are wondering whether a heat pump can cool your house in summer, the short version is that cooling is the easy half of its job. Every heat pump contains the same compressor, coils and refrigerant loop as a central air conditioner, plus one extra part — a reversing valve — that lets it run the cycle backwards in winter. Set the thermostat to cool and it behaves like the AC you already know, with a few differences worth understanding before you buy.
Cooling mode is the same refrigeration cycle as central AC
In cooling mode a heat pump absorbs heat at the indoor coil and rejects it at the outdoor unit, exactly as an air conditioner does. The reversing valve decides which coil is the evaporator and which is the condenser. Efficiency is rated the same way too: a heat pump carries a SEER2 rating for cooling alongside its HSPF2 rating for heating, so you can compare it against any AC on the same scale. A ducted heat pump uses your existing supply and return ducts; a ductless head cools one room or an open-plan floor without ducts at all.
Why an inverter heat pump often cools better than the AC it replaces
Most heat pumps sold as cold-climate units use a variable-speed (inverter) compressor. Instead of blasting at full output for 12 minutes and shutting off, it settles into long, low-speed runs that match the actual heat gain. That matters in Burlington and Oakville, where humid air off Lake Ontario can hang over the lakeshore for days in July: the longer the coil stays cold, the more moisture it wrings out, so the house feels cooler at the same thermostat setting.
- Longer, gentler cycles remove more humidity than short blasts — see why a house feels humid with the AC on.
- Modulating output means smaller temperature swings between cycles, usually within half a degree of the setpoint.
- Low-speed operation is quieter at the outdoor unit and at the registers.
- The same equipment then heats the house through the shoulder seasons and most of winter, with the furnace as backup if you keep it alongside the heat pump.
Sizing: a heat pump chosen for winter must still cool without short-cycling
The catch most people miss is sizing: a cold-climate heat pump is often chosen for the heating load, which in Burlington can be larger than the cooling load. On a single-stage unit that oversizing would cause short cycles and a clammy house in July. An inverter unit avoids the problem by turning down to a fraction of its rated capacity on mild days, which is one reason we steer away from single-stage heat pumps for homes that need real dehumidification. Ask your installer to show both the heating and cooling load calculations, not a square-footage guess, and read what size heat pump you need before comparing quotes.
Ductwork matters as well. The 1950s and 60s bungalows in Roseland and Aldershot were built with small supply runs for a gas furnace, and a heat pump moves more air at lower temperatures than the furnace did. If the ducts cannot carry that air, the system will be loud and the far bedrooms will stay warm. A static-pressure test during the quote visit tells you whether the existing ducts are adequate.
What it costs to cool with a heat pump instead of an AC
In cooling mode a heat pump uses about the same electricity as an air conditioner with the same SEER2 rating, so your summer Burlington Hydro bill should look similar or slightly lower if you moved from an older 13 SEER unit to a modern inverter model. The upfront price is higher: a 3-ton cold-climate heat pump installs for $9,500–$15,000, versus $3,500–$7,500 for central AC, and current Ontario programs return up to $7,500 depending on the system. If your air conditioner is due for replacement anyway, that gap is what you are paying for year-round heating capacity. Our heat pump vs. furnace guide walks through the full comparison.
Quick answers to related questions
- Can a heat pump cool in a heat wave? Yes. Cooling capacity is rated at 35°C outdoors and the units keep running above that; output tapers slightly on the hottest afternoons, as it does for any AC.
- Does a ductless heat pump cool as well as a ducted one? Room by room, yes, and often better, because each head has its own thermostat. Whole-house coverage needs a head or a ducted air handler for every zone.
- Do I need a new thermostat? Usually. A heat pump thermostat manages the reversing valve and the backup heat, so a plain AC thermostat will not run it correctly.
If you are weighing a heat pump against a straight AC replacement, ZK Mechanical can run both load calculations at the same visit and show you the numbers side by side. We install and service cold-climate heat pumps across Burlington, Oakville and Hamilton — book a free quote or call (647) 801-1252.