Heating load in Red Deer
A home in Red Deer has to be heated against a design temperature of −33.0 °C. That figure is measured, not modelled: it is the 1st percentile of daily minimum temperature over 29 years at Red Deer Regional, 12 km away.
Design temperature
−33.0 °C
Heating degree days
4,750
Coldest month
Jan
Coldest night on record
−43.8 °C
How many kilowatts
Heating power needed at the design temperature, in kilowatts, for a detached house. Pick the row that matches the building.
| Construction | Detached | Semi-detached | Terraced | Top-floor flat | Mid-floor flat | Ground-floor flat |
|---|---|---|---|---|---|---|
| Uninsulated, single glazed | 34.2 kW | 30.0 kW | 26.6 kW | 29.2 kW | 14.2 kW | 17.4 kW |
| Unfilled cavity, early double glazing | 23.1 kW | 19.9 kW | 17.4 kW | 16.9 kW | 10.3 kW | 12.9 kW |
| Insulated to 1980s standards | 13.2 kW | 11.9 kW | 10.8 kW | 10.2 kW | 7.3 kW | 9.3 kW |
| Modern, roughly 1995-2010 | 8.1 kW | 7.4 kW | 6.8 kW | 6.5 kW | 5.0 kW | 6.0 kW |
| Current building regulations | 6.2 kW | 5.7 kW | 5.3 kW | 5.1 kW | 3.8 kW | 4.7 kW |
| Passive house | 3.7 kW | 3.3 kW | 3.0 kW | 2.9 kW | 2.0 kW | 2.6 kW |
Where the heat goes
For a 120 m2 detached house of this construction, at the design temperature.
| Element | W | Share |
|---|---|---|
| Walls | 4,354 | 33% |
| Roof | 1,272 | 10% |
| Ground floor | 859 | 7% |
| Windows | 2,480 | 19% |
| Thermal bridges | 729 | 6% |
| Ventilation and draughts | 3,514 | 27% |
| Heating load | 13,207 | 13.2 kW |
Calculate it for your own home
The climate half of this is measured. The building half is yours to supply.
Monthly mean temperature
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | −11.3 | −9.5 | −4.4 | 3.6 | 10.1 | 14.0 | 16.4 | 15.3 | 10.5 | 3.4 | −4.6 | −10.2 |
Where these numbers come from
- Measured: the design temperature, the degree days and the monthly means. All of it from one station, Red Deer Regional, over 29 complete years.
- Assumed: everything about the building. The U-values are typical published figures for each construction era, not a survey of your house. Two houses of the same age and size can differ by a factor of two.
- No credit is taken for sunshine or for the heat given off by people and appliances. That is the EN 12831 convention, because the design condition is a still, dark night.
- This is space heating only. Domestic hot water is a separate load.
- This is a calculation, not a survey. Before spending money, have the building assessed.