If your heat pump has stopped heating (or cooling) and you’re trying to decide whether it’s worth an emergency call, here’s the short version: it is if the temperature inside your home is dropping toward a level that puts pipes, pets, or people at risk, or if you smell something chemical, hear grinding, or see sparking near the outdoor unit. In every other case, a same-day or next-morning appointment is usually the smarter, cheaper option. This guide walks through what actually counts as an emergency, what happens once a technician is dispatched, real 2026 Ontario repair costs by part, and how to decide between fixing your current system and replacing it outright.
This is written for homeowners across Hamilton, Burlington, Oakville, Milton, Brantford, Cambridge, and Kitchener, not technicians, so we’ll keep the jargon to a minimum. In our experience, roughly half the “emergency” calls we see in a Golden Horseshoe winter turn out to be same-day fixes once a technician actually looks at the unit, while the other half genuinely can’t wait. The checklist below helps you tell which one you’re dealing with before you pick up the phone.
Not every heat pump problem needs a technician tonight. An emergency is really about risk, either to your home or to the people in it, not just inconvenience. Use this checklist before you call.
If none of those apply and your home is still holding a reasonable temperature, either on backup heat or because the outage just started, it’s almost always safe and cheaper to book a same-day or next-morning appointment instead of paying after-hours rates. A heat pump that’s simply not heating well, or tripped a breaker once, falls into that second category far more often than homeowners expect. If you’re still not sure what’s actually wrong, our heat pump not working guide covers the fast checks worth trying before you book any appointment at all.
Emergency HVAC dispatch follows a fairly predictable sequence, and knowing it ahead of time makes the call itself faster. In the Golden Horseshoe, most licensed contractors run a 24/7 answering service that triages calls, dispatches on-call technicians, and gives a realistic arrival window rather than an exact time.
The diagnostic fee is standard practice, typically CAD $90 to $180 for an after-hours visit, and most reputable contractors credit it toward the repair cost if you go ahead. Be wary of any company that won’t quote a diagnostic fee upfront over the phone. Once the technician arrives, most common failures, capacitors, contactors, defrost boards, are fixed the same visit from parts carried on the truck. Compressor or reversing valve replacements sometimes require a special order, in which case the technician’s job shifts to getting your backup heat or a temporary space heater running safely until the part arrives.
If you want a head start on narrowing down what’s actually wrong before the technician arrives, our free tool below walks through the same questions a dispatcher would ask.
Answer a few quick questions about what you’re seeing and hearing to get a likely cause and next step before your technician even arrives.
Answer 5 quick questions about your heat pump symptoms and get a likely diagnosis with recommended next steps.
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Note: This diagnosis is based on common symptom patterns and is for informational purposes only. A certified HVAC technician should inspect your system for an accurate diagnosis.
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GET FREE QUOTESThe single biggest driver of your final bill is which part failed, not the fact that it’s an emergency. Here’s what Ontario homeowners typically pay in 2026 by repair type, before any after-hours surcharge.
| Repair | Typical Cost (CAD) | Same-Visit Fix? |
|---|---|---|
| Capacitor or contactor | $150 – $450 | Usually yes |
| Defrost control board | $250 – $650 | Usually yes |
| Reversing valve | $700 – $1,800 | Sometimes; valve may be special-order |
| Refrigerant leak (diagnosis, repair, recharge) | $400 – $1,500+ | Depends on leak location |
| Compressor replacement | $1,800 – $4,000+ | Rarely; almost always special-order |
Ranges reflect typical Ontario service quotes (CAD) as of 2026, based on parts and standard labour, and vary by contractor, brand, and system age. Always confirm with a written local estimate before work begins.
On top of the repair itself, expect an after-hours emergency surcharge of roughly $150 to $350, or some contractors apply a flat 1.5x to 2x multiplier on labour for calls outside 8am to 6pm, weekends, and holidays. That surcharge is the price of speed, not a sign you’re being overcharged, but it’s worth asking for in writing before the technician starts work. If the failure isn’t life-safety related and your home is holding a livable temperature, waiting until regular business hours can meaningfully lower your bill.
A technician standing in your driveway at 11pm isn’t the ideal moment to make a permanent decision, but sometimes the diagnosis forces the question anyway. Three factors matter more than any single repair quote.
Emergency compressor and reversing valve failures are where this decision comes up most often, since both repairs sit close to that 50% threshold on an older system. If your technician quotes one of these on a unit that’s already 10-plus years old, it’s worth asking for the replacement estimate alongside the repair estimate before you commit to either. Our heat pump buying guide for Canadian homeowners breaks down what a new cold-climate system costs after current rebates, so you can compare the two numbers side by side.
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This question matters most in the exact moment your heat pump fails: if you have backup heat, an emergency call can often wait until morning. If you don’t, it can’t.
Modern cold-climate heat pumps are rated to keep working down to roughly -25°C, and Natural Resources Canada’s guidance notes that below about -30°C, most systems need a supplemental source to maintain comfort. Most Golden Horseshoe homes rarely see design temperatures that extreme, but the practical reason to have backup heat isn’t really about the coldest night of the year, it’s about what happens on the night your primary system fails during a normal cold snap. A dual-fuel setup with a gas furnace, or integrated electric resistance elements in a ducted system, both do the same job here: they keep the house livable while you wait for a scheduled repair instead of paying emergency rates.
| Setup | What Happens If the Heat Pump Fails |
|---|---|
| Hybrid (heat pump + gas furnace) | Furnace can typically be set to run alone; usually no emergency call needed |
| Ducted with electric backup elements | Backup strip heat keeps the home warm at higher operating cost until repaired |
| Ductless mini-split, no backup | No fallback heat source; failure during cold weather is a genuine emergency |
If your system is a standalone ductless heat pump with no furnace or baseboard backup, that’s worth flagging to your insurer and worth planning for now, not during the next cold snap. Electric baseboards in one or two key rooms are a relatively inexpensive way to close that gap. Our heat pump not working guide also covers what to safely try while you’re waiting on a technician, regardless of which setup you have.
Most emergency calls trace back to a problem that was visible weeks earlier. A small amount of routine care catches most of them first.
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Only if indoor temperature is dropping without backup heat, or you notice sparking, smoke, or a chemical smell. Otherwise, a same-day appointment usually costs less.
Most licensed contractors target a 1 to 4 hour arrival window for genuine emergencies, and same-day for everything else, though this varies by contractor and weather conditions.
Expect an after-hours surcharge of roughly $150 to $350, or a 1.5x to 2x labour multiplier, on top of the standard repair cost for the part that failed.
Yes, and you should. A hybrid furnace or electric backup elements can safely carry the heating load until your heat pump is repaired, often removing the need for an emergency call entirely.
If indoor temperature is holding steady on backup heat, yes. If there's no backup and the home is dropping below 12 to 14°C, treat it as an emergency instead.
When the system is past 10 to 12 years old and the repair quote, usually a compressor or reversing valve, runs close to half the cost of a new system.
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