My average is 17.8 Kwh so a good 5000 watt 40 amp heater is gonna cost maybe 50cents an hour in a R20 insulated garage. Although insulation under the concrete floor changes things. Pretty cheap regardless.
In Ontario, "Delivery"
: "a portion of the cost is fixed and a portion varies depending on the amount of electricity used". Typical Ontario Hydro double speak. Assume it's 10% fixed and the remainder 90%.
I have a hydronic floor but haven't turned it on in ages because with it's insulated floor and R20 and R40 combo insulation it remains about 7C all winter. If I do want to work inside for a few hours which is rare these days I use a 1500 watt electric space heater.
On the other hand my son uses his garage as a temporary office and he keeps that at 72F. When he moves out of there he'll probably drop it down quit a bit. You listen to the nutters running the government and it's scary about how much they'll tax energy going forward. Hence, we didn't fart around on the insulation/heating. The space is as good as it can be other than having it's own air exchanger.
