Gas furnace
Lennox ML296V
96% AFUE, two-stage, variable-speed blower, 45,000 to 110,000 BTU
20-year limited heat exchanger warranty
St. Thomas · Elgin County
HVAC Contractor in St. Thomas for Older Homes and New Builds
From wartime houses downtown to brand-new streets at the edge of the city
St. Thomas is growing fast, and HVAC in St. Thomas now covers two very different jobs: bringing older downtown and wartime homes up to date, and getting new builds set up right before small problems turn into habits. We install and repair furnaces, air conditioners and cold-climate heat pumps across the city and Elgin County, and we handle the heat pump rebate paperwork. Each quote comes in writing, and it's guaranteed.
- Builder-grade systems checked and corrected
- Older homes upgraded to efficient furnaces and heat pumps
- Rebate pre-approval filed for you
- Emergency help after hours, on weekends and on holidays
Voted Best Company 2019 to 2021 · Authorized Midea, Lennox, Kepler & Rinnai dealer, plus Goodman · 20+ years
Our Brand Partners
St. Thomas heating and cooling, quick facts
A small city with a wide mix of housing. These are the facts we plan around.
- HomesWartime houses to new subdivisions
Older homes near downtown, wartime and post-war houses, and new subdivisions spreading north toward London.
- UtilitiesEntegrus and Enbridge Gas
Entegrus supplies your electricity and Enbridge your gas. Both rates go into our running-cost estimates.
- ClimateLake Erie influence
With Lake Erie just to the south, summers turn humid and winters bring lake-effect snow, so cooling and heating both matter.
- HoursOpen every day of the week
We're open 8 am to 8 pm Monday through Saturday and 10 am to 5 pm on Sundays, with emergency calls taken evenings, weekends and holidays.
What a St. Thomas HVAC contractor runs into in old and new homes
Older houses and brand-new ones fail in different ways. These are the common ones, and how we fix them.
The new house came with a furnace that's too big
Builders often size by rule of thumb. An oversized furnace short cycles, wears out sooner and leaves hot and cold rooms. We run a heat-loss calculation, adjust what we can now and plan the right size for replacement.
The bedroom over the garage is cold in winter and hot in summer
Rooms over a garage lose heat on several sides and usually sit at the end of a long duct run. We check airflow, balance the dampers and add a ductless head if the ducts can't keep up.
Your new build has central air but the basement feels damp
Fresh concrete releases moisture for the first few years. We look at the AC's run time, dehumidification and ventilation, and an HRV can help move that damp air out of the house.
A wartime house still runs a 1990s mid-efficiency furnace
Older furnaces send a share of every gas dollar up the chimney. A 96% to 97% AFUE two-stage furnace, or a hybrid heat pump setup, cuts that waste, with new PVC venting run out the side wall.
You want a heat pump but the rebate process looks like a maze
We confirm your rebate tier, file the pre-approval before installation and handle the forms after. If electricity, oil or propane heats the house now, you may qualify for as much as $7,500.
Upstairs in an older home never cools off during a heat wave
Small ducts and a single return upstairs starve the second floor of air. We measure, add a return where we can, size the new system to the ducts, or bring in a ductless head for the rooms that need it.
The builder put the AC condenser right under the bedroom window
Builders place outdoor units where the line set is shortest, not where they're quietest. When the unit is due for replacement, we move the new one to a spot that's out of earshot, run a fresh line set and pick an inverter model that hums instead of roars. In Orchard Park and the newer streets, that one change is often the biggest comfort gain of the whole job.
Sound familiar?
Describe the problem and we'll tell you what it usually is, what it costs to fix, and whether it's worth fixing.
St. Thomas HVAC prices for older homes and new builds
A wartime house in Lyndale and a three-year-old build near the north end rarely need the same work. These are the starting points before your written quote.
| Service | Typical price in St. Thomas |
|---|---|
| High-efficiency furnace, installed Lennox ML296V or Midea MGH96, 96% to 97% AFUE, two-stage variable-speed | From $3,300 |
| Cold-climate heat pump, installed Midea EVOX G3 or Kepler, 2 to 5 ton, rated to -30°C | From $5,500 |
| Central air conditioner, installed Lennox or Midea, sized from a heat-gain calculation | Written quote |
| Furnace repair Diagnostic visit plus common parts such as ignitors, flame sensors and capacitors | Quote after diagnosis |
| AC repair Diagnostic visit plus common parts such as capacitors, contactors and refrigerant leak repair | Quote after diagnosis |
Installed pricing depends on size and installation requirements, and every job gets a written, guaranteed quote. Qualifying cold-climate heat pumps can bring back up to $7,500 through the Home Renovation Savings Program, and financing runs 0% for 3, 6 or 9 months on approved credit.
Installs from across our Ontario service area
Recent jobs from our crews in other Ontario communities. A Lyndale bungalow or an Orchard Park new build gets the same careful finish.
HVAC services in St. Thomas and Elgin County
Find the service you need. Each page explains the equipment, the cost and what happens on install day.
Furnace repair in St. ThomasShort cycling, no heat and noisy blowers, with a written price first.Furnace installation in St. Thomas96% to 97% AFUE two-stage furnaces from Lennox and Midea.Heat pump installation in St. ThomasCold-climate models rated to heat at -30°C, with the rebate pre-approval filed by us.AC repair in St. ThomasWeak cooling, frozen coils and condensers that won't start.HRV and ERV for new buildsBalanced fresh air for tightly built new homes.Wi-Fi thermostats with schedulingBetter scheduling and a possible $100 rebate on qualifying models.Heat pump rebate helpHow the Home Renovation Savings Program works and what we file.
Your St. Thomas HVAC upgrade in four steps
Old house or new, the process is the same and the price holds.
- 1
Reach out
Phone us or use the form. Tell us roughly how old the home is and what's bothering you.
- 2
Home visit
We check the equipment, ducts, panel and gas line, and run a heat-loss calculation for any new system.
- 3
Written quote and rebate check
One guaranteed price, your rebate tier confirmed and financing options laid out side by side.
- 4
Permits, install and the forms
We pull permits, install and test, register your warranty and file any rebate forms.
What we install in St. Thomas homes, old and new
Two-stage furnaces for the homes that are staying on gas, and cold-climate heat pumps for the ones ready to cut back. All of it registered and warrantied by us.
Gas furnace
Lennox EL297V
97% AFUE, two-stage, variable-speed blower
20-year limited heat exchanger warranty
Gas furnace
Midea MGH96
96.5% AFUE, two-stage, variable-speed, 60,000 to 120,000 BTU
Registered warranty, up to 12 years parts and labour on select systems
Gas furnace
Goodman GMVC96
Up to 96% AFUE, two-stage, variable-speed ECM blower, 40,000 to 120,000 BTU/h input
10-year parts and unit replacement limited warranties when registered online
Cold-climate ducted heat pump
Midea EVOX G3
2 to 5 ton, inverter, R-454B, ENERGY STAR cold climate, rated to -30°C
Up to 12 years parts and labour on select systems
Ducted heat pump
Kepler cold-climate
1.5 to 5 ton, rated to -30°C, quiet operation
Registered warranty
Single and multi-zone
Midea ductless
18,000 to 60,000 BTU outdoor units, wall-mounted heads
Registered warranty
Heat pump rebates in St. Thomas: what has to happen before install day
The Home Renovation Savings Program pays out after the install, but it only pays if the steps happen in the right order. Here's the order.
- We confirm how your home is heated now, since that sets the tier. Enbridge gas homes commonly qualify for up to $2,000, and electric, oil or propane homes for up to $7,500.
- We pick a heat pump on NRCan's qualified products list and size it from a heat-loss calculation, because the amount depends on the unit's size.
- We file the pre-approval and wait for it to come back before booking the install. Installing first means no rebate.
- After the job, we submit the invoice and model details, and the payment goes to you.
No home energy assessment is needed for a heat pump on its own. Program terms can change, so we confirm eligibility before installation on every job.
What it costs, and how we keep it lower
Guaranteed pricing
Your quote is your final price. No surprise extras on the agreed scope of work.
Rebates up to $7,500
Cold-climate heat pumps may qualify through the Home Renovation Savings Program. We confirm eligibility and file the paperwork.
0% financing
Interest-free for 3, 6 or 9 months, or open loans from 2.99% on approved credit.
Up to 12 years parts and labour
Extended warranty on select systems when registered.
Want the real number for your home?
A guaranteed quote takes one visit. Rebate and financing options come with it.
St. Thomas neighbourhoods and Elgin County communities
We work across the city and down toward the lake, from Pinafore and Lyndale to Port Stanley, Shedden and Union, including:
- Downtown St. Thomas
- Lyndale
- Orchard Park
- Pinafore
- Port Stanley
- Shedden
- Union
What St. Thomas homeowners can expect: our customers in their own words
Rated 4.5 on Google and voted Best Company 2019, 2020 and 2021 on HomeStars.
4.5Google rating from verified customers
We had a heat pump/AC unit installed by EHI, on time, on budget, great workmanship. Julian and team were knowledgeable and courteous. Dustin communicated well and is managing our government rebate for the new efficient system. Thank you Team!
Replaces our AC with a new heat pump in Ottawa and the whole experience was outstanding. From the first call, Dustin was incredibly responsive and communicated clearly every step of the way. He cut through all the usual sales fluff and got straight to what mattered — options, costs, timelines, and what made the most sense for our home. They addressed every concern I had, explained the details discussed my technical questions, and handled the installation quickly and professionally. The quality of the work is excellent, everything was done cleanly, and the system has been running perfectly since. Pricing was fair and transparent, and there were no surprises. It’s rare to find a company that combines speed, honesty, and solid workmanship like this. Highly recommended.
Recently got a shiny new heat pump installed. Went very well, nice unit and it works soooo quietly. These fine folks were very easy to deal with, professional and thourough. Would highly recommend.
Efficient Home Improvements truly went above and beyond. Our furnace failed on Christmas Eve in Ottawa, and their team stayed up late (3:00am) that night to replace it. Their responsiveness, professionalism, and dedication during the holidays were exceptional. The work was completed efficiently, and everything was explained clearly. It’s rare to find a company willing to sacrifice their own holiday time to ensure a customer’s home is warm and safe. I highly recommend Efficient Home improvements to anyone in need of reliable and compassionate service.
I recently had a new furnace and tankless water heater installed by this company. Excellent service by both office and technicians , I highly recommend!
The Installers were great.. Got in and got the job done..the furnace works amazing compared to the old one !!! Need a furnace..A/C water tankless system..there your guys!!!!
Had a tankless water heater installed and couldn’t be happier. The installation was quick, professional, and the system works great — endless hot water and more efficient than my old tank. Highly recommend!
Dustin and his team were really responsive and helpful in getting us a new heat pump to replace our broken AC unit. The team went above and beyond helping us through the process and answering other questions about the house we recently moved in to. I would highly recommend Efficient Home Improvements for any of your HVAC needs.
Licensed HVAC Contractor · Serving Ontario for 20+ Years
Proudly Serving St. Thomas, Ontario
EHI Heating And Cooling has kept Ontario homes and businesses comfortable for more than 20 years. Our licensed crews come to your home or business anywhere in St. Thomas, with a written, guaranteed quote before any work starts.
- ServingSt. Thomas, Ontario
- Phone1-647-694-5845
- Emailefficienthomecomfort@gmail.com
Business Hours
- Monday8:00 AM to 8:00 PM
- Tuesday8:00 AM to 8:00 PM
- Wednesday8:00 AM to 8:00 PM
- Thursday8:00 AM to 8:00 PM
- Friday8:00 AM to 8:00 PM
- Saturday8:00 AM to 8:00 PM
- Sunday10:00 AM to 5:00 PM
Emergency service available evenings, weekends and holidays.
We also serve communities near St. Thomas
Other cities in Southwestern Ontario we serve
Every city gets the same licensed crews, guaranteed pricing and rebate paperwork. Pick yours for local details.
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- CambridgeHVAC services
- GuelphHVAC services
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- StratfordHVAC services
- LondonHVAC services
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Frequently asked questions
Should I replace the builder furnace that came with my new house?
Not usually right away. If it's oversized or noisy, we can often adjust settings and airflow first, then plan a correctly sized replacement when it's due.
Can an older St. Thomas house run well on a heat pump?
Often, yes, when it's sized from a heat-loss calculation. Many older gas-heated homes do well with a hybrid setup that keeps the furnace for the coldest nights.
What heat pump rebate tier does a St. Thomas home fall into?
Homes heated by electricity, oil or propane may qualify for up to $7,500, and Enbridge gas-heated homes commonly up to $2,000. Pre-approval must be in place before installation, and program terms can change.
Can I get furnace repair in St. Thomas late in the evening?
Yes. We take emergency calls evenings, weekends and holidays, and you get a written price before the repair.
Does a brand-new St. Thomas house need an HRV?
Many new homes are built tight and already have one, and if yours doesn't, an HRV can help with stale air and moisture. We check what you have and whether it's working properly.
Do your St. Thomas HVAC services reach Port Stanley and Elgin County?
Yes. We book visits in St. Thomas, Port Stanley and nearby Elgin County communities from our office in Stouffville.
What should a St. Thomas homeowner budget for a heat pump install?
A cold-climate heat pump in St. Thomas starts from $5,500 installed, before any rebate, and a high-efficiency furnace from $3,300. Installed pricing depends on size and installation requirements, and we put a guaranteed quote in writing before the work starts.
Page reviewed and updated October 27, 2026. Prices, rebates and program terms are checked at each update.