Let’s get this out of the way right off the top: just because you can install a furnace yourself doesn’t mean you should.
At Handy Bros., we’ve seen the aftermath of DIY furnace jobs gone sideways — from gas leaks and electrical mishaps to complete warranty voids and insurance denials. But we’ve also talked to homeowners who genuinely want to understand what’s possible, what’s smart, and where the line is between safe DIY and needing a professional.
That’s why we created this no‑nonsense guide for Ontario homeowners who are wondering if they can install a furnace themselves — and what’s really at stake if they try.
We get it. The idea of saving a few thousand dollars is tempting. You’ve probably seen a few YouTube videos, maybe you’ve even swapped out a hot water tank or replaced your own thermostat. How much harder can a furnace be, right?
Here’s what homeowners often underestimate:
In fact, unless you’re a licensed gas technician in Ontario, installing a furnace yourself isn’t just risky — it could be illegal.
That said, we’re all for smart homeowners being involved in their home’s comfort systems. So here’s a clear list of what’s safe to DIY:
These maintenance tasks help your system run more efficiently and safely — and can even prevent bigger issues before they start.
This is where we draw the line — and so should you. These tasks aren’t just technical, they come with real risks to your safety and your home:
In Ontario, even just installing a new furnace without the right permits and inspections can lead to serious problems. Insurance companies may refuse coverage if damage occurs from unlicensed installation. Most manufacturers will void your warranty. And in the worst-case scenario, improper installation could result in carbon monoxide poisoning.
That’s not worth the risk.
Let’s break this down — not to scare you, but to be real with you. Here’s what we see:
Warranty Void:
Install a furnace yourself and you likely lose your 10 to 20‑year warranty from the manufacturer. Handy Bros. offers up to 20 years on select systems — but only if it’s professionally installed.
Home Insurance Risks:
Most insurance policies require licensed installation for HVAC equipment. If a fire or gas issue occurs due to DIY work, your claim could be denied.
Efficiency & Bills:
A poorly sized or installed furnace won’t heat properly — meaning higher energy bills, more strain on your system, and a shorter lifespan.
Resale Red Flags:
Home inspectors are trained to spot non‑code HVAC installs. A DIY job could tank your resale value or delay a sale entirely.
Our team doesn’t just install furnaces — we redefine what furnace installation should look like.
Here’s what sets us apart:
We serve Chatham-Kent, London, Windsor, Sarnia, Leamington, and St. Thomas — and we’re proud to be the local HVAC team that brings Home Comfort Done DIFFERENTLY to Southwestern Ontario.
We’re not the pushy sales type. If you’re on the fence, want to explore options, or just need a second opinion — give us a shout.
Our team offers free, no-pressure advice for any homeowner thinking about furnace upgrades or replacements. We’ll walk you through your options, answer your technical questions, and help you make the right call — whether you hire us or not.
If you’re changing a filter or checking a thermostat, you’re being a smart homeowner. But if you’re thinking about replacing your furnace solo — stop.
There’s too much at stake, and there’s too much we can do to help.
Let’s chat. One call could save you thousands — or more importantly, protect your family from unnecessary risk.
Mitch has been a valued member of the Handy Bros. team for over 9 years. He began his journey in the installation department, quickly rising through the ranks into management, where he successfully led multiple departments. In 2018, Mitch and his brother Nic took ownership of Handy Bros., continuing the legacy with a fresh vision—Home Comfort Done Differently. Mitch is happily married to his beautiful wife, Jessica, and is a proud, devoted father. Outside of work, he’s passionate about health and fitness, and has a deep appreciation for delicious Portuguese cuisine. When it comes to travel, anywhere in Southern Europe is his happy place.
