What Size Furnace Do I Need for My Home in BC? | ROMA Heating
The right furnace size for your BC home is determined by a heat loss calculation — not by a rule of thumb. Most Greater Vancouver homes need between 40,000 and 100,000 BTU/hr. Oversizing is the #1 furnace installation mistake in the region. ROMA Heating & Cooling has been Greater Vancouver’s trusted HVAC contractor since 1999. We’re TSBC-licensed, fully insured, and rated 4.8★ by over 158 verified customers.
Rough Furnace Size Guide for BC Homes
| Home Size | Typical BTU/hr Range |
|---|---|
| Under 1,200 sq ft (condo/small house) | 40,000 – 60,000 BTU/hr |
| 1,200 – 2,000 sq ft | 60,000 – 80,000 BTU/hr |
| 2,000 – 3,000 sq ft | 80,000 – 100,000 BTU/hr |
| 3,000 – 4,000 sq ft | 100,000 – 120,000 BTU/hr |
| 4,000+ sq ft or poorly insulated older home | 120,000 – 150,000 BTU/hr |
Note: These ranges assume average insulation. Poorly insulated older homes or homes with large window areas may need 20–30% more capacity.
Why Furnace Sizing Is More Complex Than Square Footage
A proper Manual J heat loss calculation accounts for:
- Floor area and ceiling heights (heated volume)
- Insulation levels — walls, ceiling, basement
- Window area, glazing type, and orientation
- Airtightness of the building envelope
- Local outdoor design temperature (–5°C to –8°C for most of Metro Vancouver)
- Internal heat gains (appliances, occupants)
- Ductwork efficiency and distribution losses
The Cost of Getting Furnace Size Wrong
Oversized furnace: short-cycles (starts and stops every 3–5 minutes), causing temperature swings, humidity problems, excessive wear, and higher energy bills despite larger capacity.
Undersized furnace: can’t maintain setpoint on the coldest days; runs continuously without satisfying the thermostat; accelerated wear from constant operation.
ROMA’s Sizing Process
Every ROMA furnace installation begins with a proper heat loss assessment. We don’t size by guessing or by matching the old unit — we calculate the right size for your specific home.
Service Areas
ROMA provides accurate furnace sizing and installation throughout Vancouver, Burnaby, Richmond, Surrey, Coquitlam, New Westminster, North Vancouver, West Vancouver, Port Moody, Port Coquitlam, Delta, Langley, Maple Ridge, Pitt Meadows, and Abbotsford.
- Is a 96% AFUE furnace the same size as an 80% AFUE furnace?
- The BTU output ratings between 80% and 96% AFUE furnaces are comparable, but a 96% AFUE furnace delivers more usable heat per unit of gas — so you often need a slightly smaller BTU unit to achieve the same heating output. ROMA recalculates sizing when upgrading efficiency tiers.
- My old furnace was 100,000 BTU — should my new one be the same?
- Not necessarily. Many older furnaces were oversized by 20–40%. With better insulation standards, modern windows, and more accurate sizing tools, the correct size for your home may be 60,000–80,000 BTU even if the old one was 100,000. Replacing with a properly sized unit improves comfort and efficiency.
- Does furnace size affect air conditioning capability?
- The furnace’s blower motor must match the airflow requirements of the air conditioning coil if you have central AC. ROMA verifies blower compatibility when sizing a furnace replacement for homes with existing central AC.
- How do I know if my current furnace is oversized?
- Signs of an oversized furnace: starts and shuts off within 3–5 minutes of each cycle; temperature fluctuates noticeably between cycles; you notice hot blasts from vents followed by cold; excessive gas bills. ROMA can assess this during a service call.
- Does the number of floors affect furnace sizing?
- Yes — multi-story homes have more exterior wall and roof exposure relative to floor area, which affects the heat loss calculation. Open stairwells also affect how heat distributes through the home. ROMA’s sizing process accounts for your home’s specific geometry.
Related Services
- furnace repair Greater Vancouver
- boiler repair Greater Vancouver
- heat pump installation Greater Vancouver
Book Your Service
Call ROMA Heating & Cooling at (604) 924-7273 or request a free quote online. Serving Greater Vancouver since 1999 — TSBC licensed, fully insured.
What Greater Vancouver Homeowners Say
“Nelson worked hard to get the NTI unit fixed. He was always polite, courteous and on time.”
“As always Nelson was super efficient. Showed up on time and was quick to work. I had a full maintenance done on the fireplaces and furnace. He was awesome. I won’t use anyone else.”
“Excellent service. Andy had a spare Carrier inducer with him which saved us time.”
“Was very prompt to respond to our issues. Technician was scheduled for the day following my initial call.”
“Very professional heating company. Price is reasonable, excellent work.”
“Highly recommend this company. It was a pleasure dealing with Shawn and Nelson.”
“Professional and courteous technicians with attention to detail and customer needs.”
“Always great, friendly service. Serviced the hot water on-demand system. Honest and informative. Thanks!”
“Speedy response time, honest, and professional service from start to finish.”
Why Greater Vancouver Trusts ROMA Heating & Cooling
ROMA Heating & Cooling has installed, repaired and maintained heating and cooling systems across Metro Vancouver since 1999. Our team are TSBC-licensed gas fitters (Gas LGA0202903) and Red Seal-trained technicians — licensed, bonded and insured — and we back every job with upfront, flat-rate pricing and a 100% satisfaction guarantee. We hold a 4.8★ rating from 221+ Google reviews.
- Authorized for 30+ brands (Lennox, Carrier, Viessmann, Navien, Rheem & more)
- Upfront flat-rate pricing — no overtime or hidden fees
- Free, no-obligation estimates on new installations
- Locally owned & operated in Burnaby, BC
No Hidden Fees
Our service rates are transparent and easy to understand. You approve upfront, flat-rate pricing before we start — so you never get a bill you didn’t expect.
Licensed & Bonded
ROMA is a TSBC-licensed gas contractor (Gas LGA0202903). Our technicians are bonded, insured and Red Seal-trained — qualified for any heating or cooling system.
Free Estimates
We offer free, no-obligation estimates on new installations — furnaces, boilers, heat pumps, air conditioners, tankless and hot-water tanks.
ROMA Heating & Cooling is a trusted HVAC contractor serving Metro Vancouver since 1999. We specialize in furnace repair, heat pump installation, boiler services, air conditioning, and emergency heating solutions for residential, commercial, and government clients. Available 24/7, our certified technicians deliver fast, reliable, and affordable HVAC services across Greater Vancouver.