What kind of heating system do I have? That is an essential issue, especially when the furnace isn’t operating and you need to call the heater repair guy. There are two typical kinds of furnaces. There’s forced air and there’s the boiler type.
How do you determine which you have? It’s pretty easy. If you have “registers” in each space that have warm air blowing out of them, that’s forced air.
If you have radiators, either freestanding or baseboard type, that suggests that you have a boiler
An additional method to use boilers is radiant floor heat. That’s a bunch of pipes that run through the floor and warm the floor up, which heats up the room. Very good, but expensive to install.
You can have heat that’s not coming from a furnace. You could have electric baseboard heat. Or electric wall heaters. You could have a gas wall heater.
Second point to determine is what fuel your heater uses. There are six common kinds.
Coal, not the usual, typically used with a boiler. If you have coal, you most likely noticed.
Electric heat is easy, but pricey. It’s one of the most costly heat source.
Fuel Oil, If you’ve been in the house for a while then you will have loaded a fuel oil storage tank. Generally used with a boiler.
LPG or propane. That’s an above ground tank that gets filled every now and then. Generally rural homes, with gas furnaces that don’t have gas piped to the house use propane.
Natural gas, or methane, that’s the gas which is piped to urban homes, It’s a pretty typical way to heat homes. It burns clean, it’s relatively affordable and it’s generally pretty trouble free.
Wood, you probably observed. You ‘d have a wood stove or a fireplace in the living room and a stack of wood outdoors.
That pretty well addresses it, if you reside in a house. It should not take too long to nose around and identify exactly where the heat is or should be coming from.