Where the Energy Goes in a Typical Oshawa Home Heating System
When homeowners in Oshawa ask us how to lower their heating bill, the honest answer is that it depends where the energy is going. Some of it leaves through the chimney, some through the ducts, and some through the house itself.
Up the flue
An older mid-efficiency furnace (around 80% AFUE) sends roughly a fifth of the fuel’s energy up the chimney. A high-efficiency condensing furnace recovers most of that by cooling the exhaust until water condenses out, which is why its venting is plastic pipe. If your furnace is old and mid-efficiency, this is the biggest single loss.
In the ducts
Ducts that run through unheated spaces, like a garage, crawlspace or attic, lose heat through the walls and through leaky joints. Ducts in a finished basement leak into the basement, which isn’t a total loss but does mean the upstairs gets less.
Through poor airflow
A furnace with a dirty filter or undersized return ducts runs hotter and longer for the same heat delivered. That costs fuel and wears the heat exchanger.
In short cycling
A furnace that’s too big, or a thermostat that’s badly placed, starts and stops constantly. Each start is less efficient than steady running. Two-stage and modulating furnaces avoid most of this.
Through the house itself
Air leaks around doors, windows and the rim joist, and thin attic insulation, often matter more than the furnace. Natural Resources Canada’s energy efficiency resources cover home energy evaluations if you want to look at the whole house.
What maintenance actually does
Maintenance won’t turn an 80% furnace into a 96% one. What it does is keep the furnace running at its rated efficiency: clean burners, correct gas pressure, a clean flame sensor, a clear condensate system, and good airflow. Neglected equipment drifts away from its rating over the years.
If you want an honest look at where your system is losing energy, get in touch or call 647-657-2977. See our heating services too. We work in Oshawa and the rest of the GTA.
