Gas furnace
Lennox ML296V
96% AFUE, two-stage, variable-speed blower, 45,000 to 110,000 BTU
20-year limited heat exchanger warranty
Oshawa · Durham Region
Furnace Installation in Oshawa for Older Homes and Old Ductwork
Old brick, old chimneys and old ducts are our kind of job
Most HVAC calls in Oshawa's older neighbourhoods come down to three things: an aging furnace, the chimney it vents into, and ductwork that was never sized for modern equipment. We install 96% to 97% AFUE furnaces that vent out the side wall, give you a straight answer on the chimney liner question, and add heat pumps to the ducts you already have.
- New PVC venting for high-efficiency furnaces
- Ducts tested before we size new equipment
- TSSA-certified gas technicians on every furnace job
- Permits and rebate paperwork handled
- 96% to 97%AFUE furnaces we install
- -30°CHeat pump rating
- Oshawa PowerLocal hydro utility
Our Brand Partners
Older home, older system: what an Oshawa HVAC contractor fixes
Homes near downtown and the post-war streets around them share a handful of HVAC headaches. Here is what causes each one and how we sort it out.
You were told the chimney needs a liner and nobody said why
When a new high-efficiency furnace stops using the chimney, the gas water heater can be left alone in a flue that is now too big for it. That can cause poor draft and condensation inside the brick. We price both fixes: a properly sized liner, or a water heater that vents out the wall so the chimney is retired.
The furnace is decades old and the gas bill keeps creeping up
Older mid-efficiency furnaces send a good chunk of their heat up the chimney. A two-stage, variable-speed furnace at 96% to 97% AFUE vents through PVC pipe out the side wall and needs a condensate drain, both of which we plan before install day.
Rooms at the end of the duct run never get warm
Old ducts are often undersized, crushed or leaking at the joints. We test static pressure, seal what we can reach and add returns where rooms are starved, so the new furnace isn't fighting the ductwork.
Dust puffs out of the registers when the blower starts
That usually points to open returns pulling air from the basement and a missing or poorly fitted filter. We seal the return side and install a proper filter cabinet as part of the job.
You want a heat pump but can't face replacing the ducts
A heat pump needs more airflow per ton than most old furnaces were designed for. We measure your ducts first, then size the heat pump to what they can carry, often as a hybrid with your furnace as backup.
The furnace room in the bungalow is barely bigger than the furnace
A properly sized high-efficiency furnace is often smaller in BTU than the one it replaces. We check clearances, venting routes and service access before picking the model, so it fits and stays easy to maintain.
The basement ceiling is finished and the trunk line is hidden behind drywall
We can still learn a lot without opening anything. Static pressure readings at the furnace and airflow at each register tell us how restricted the ducts are, and a small access panel near the trunk lets us seal the worst joints with mastic. If something can't be reached, we say so and size the equipment to the ducts as they are, rather than guessing.
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.
Oshawa furnace, venting and liner costs at a glance
The furnace has a starting price. The chimney liner, the venting route and any duct repairs are measured on site and written into the same guaranteed quote.
| Service | Typical price in Oshawa |
|---|---|
| High-efficiency furnace, installed Lennox ML296V or Midea MGH96, 96% to 97% AFUE, two-stage variable-speed | From $3,300 |
| Furnace repair Diagnostic visit plus common parts such as ignitors, flame sensors and capacitors | Quote after diagnosis |
| 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 |
| Rinnai tankless water heater, installed RX160iN or RX199iN condensing, with venting and gas line | From $3,300 |
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.
Know your Oshawa house before you buy a furnace
The age of the house decides most of the hard parts of the job. Here is what we look for.
- HousingWartime homes to north-end subdivisions
Older brick and wartime houses near downtown, post-war bungalows, and newer homes in north-end areas like Windfields and Kedron.
- VentingChimney or side wall
Older furnaces vent up the chimney. High-efficiency models vent through PVC pipe out the side of the house, which changes what the chimney still does.
- UtilitiesOshawa Power and Enbridge Gas
We look at both bills before suggesting a heat pump, so the running cost comparison uses your real rates.
- ClimateLake winds, cold winters
Wind off Lake Ontario finds every gap in an old brick wall. The heat-loss number matters far more than the square footage.
Can your old ducts carry a heat pump? What we check first
A hybrid system pairs a cold-climate heat pump with a gas furnace. The heat pump handles cooling and most of the heating, and the furnace takes over in deep cold. It is often the best way to bring an older home's gas bill down without a full rebuild.
The catch is airflow. Heat pumps move more air per ton than the furnaces many older houses started with, and tired ducts can be the bottleneck. Skip the checks and you get noise, weak heat and a system that never reaches its rating. So before we quote, our licensed refrigeration techs look at:
- Static pressure across the existing duct system
- Supply and return sizes against the airflow the heat pump needs
- Whether the new coil fits the plenum above the furnace
- Panel space for a 240V circuit
- An outdoor spot clear of roof drip lines and the neighbour's window
How our HVAC technician in Oshawa plans a furnace upgrade
Old houses reward a careful plan. This is how we build one.
- 1
Look at the whole venting picture
Furnace, water heater and chimney get checked together, since changing one affects the others.
- 2
Test the ducts
We measure static pressure and airflow so the new equipment is sized to what your ducts can actually deliver.
- 3
Price the options side by side
Furnace only, hybrid heat pump, liner or new water heater venting. Each option comes with a guaranteed price.
- 4
Install, permit and register
We pull permits, run the new venting and drain, commission the system and register your warranty.
Heating and cooling in Oshawa, quoted before we touch a thing
Older homes hide surprises. That is exactly why we find them during the quote visit, not halfway through the install. Your written quote covers:
- Furnace or heat pump model, size and efficiency rating
- Venting route and where the pipes leave the wall
- Condensate drain and any pump needed
- The plan for the chimney and water heater
- Duct sealing or added returns
- Rebate estimate and financing options
The price on the quote is the price you pay for that scope.
A few recent furnace and heat pump jobs
Recent work from our crews around Ontario. An older Oshawa home gets the same clean venting and tidy pipe runs.
Side-wall-vented furnaces and heat pumps for older Oshawa homes
Every furnace here vents through PVC out the wall, which is what raises the chimney question. The Rinnai units vent the same way, so the chimney can be retired for good.
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
Condensing tankless
Rinnai RX160iN
0.97 UEF, up to about 9 GPM
Rinnai warranty, extended coverage may be available
Condensing tankless
Rinnai RX199iN
0.98 UEF, up to about 11.1 GPM
Rinnai warranty, extended coverage may be available
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.
Oshawa service pages
Detailed local pages for the work we do most often in Oshawa.
What Oshawa 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 Oshawa, 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 Oshawa, with a written, guaranteed quote before any work starts.
- ServingOshawa, 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 Oshawa
Other cities in Durham Region we serve
Every city gets the same licensed crews, guaranteed pricing and rebate paperwork. Pick yours for local details.
Frequently asked questions
Do I need a chimney liner when I replace my furnace in Oshawa?
Only if a gas water heater will keep using the chimney on its own. In that case a properly sized liner, or switching the water heater to side-wall venting, keeps the draft safe.
Can a high-efficiency furnace vent out the side of an older house?
Yes. Furnaces at 96% AFUE and above vent through PVC pipe out a side wall, and we plan the route to meet code clearances from windows, doors and the gas meter.
Will my old ducts work with a new heat pump?
Often they will, with some fixes. We test static pressure and duct sizes first, then size the heat pump to the airflow your ducts can deliver. Where the ducts come up short, a smaller heat pump in a hybrid setup, with the furnace covering the coldest days, usually makes more sense than tearing out ceilings.
How much does furnace installation in Oshawa cost?
Expect a starting price of $3,300 installed for a high-efficiency furnace. Venting changes, a chimney liner or duct repairs add to that, and every item is listed on a guaranteed quote.
Is a hybrid heat pump worth it in an older Oshawa home?
For many older homes it is. The heat pump covers cooling and milder heating days, the furnace handles the deep cold, and gas use drops without replacing the ductwork.
Do you do furnace repair in Oshawa outside business hours?
Yes. Emergency calls are taken evenings, weekends and holidays, and our regular hours are Monday to Saturday 8 am to 8 pm and Sunday 10 am to 5 pm.
Page reviewed and updated October 27, 2026. Prices, rebates and program terms are checked at each update.