Every one of us has an old propane boiler for heating the home plus are really satisfied with its efficiency. As of late it has been acting weird plus the two of us will now have to update it. Every one of us are going to just put in another 1 but we want to stick with using propane because it is much cheaper than other means of heating. I guess solar heating is legit, and the cheapest of them all, but it requires a large outlay of money to get started plus the two of us don’t have enough money at the moment. I really don’t think much about solar plus if it is able to cool down the condo too or if you need an alternate means for cooling. I’m sure solar is good for heating the condo in the Winter, as long as you have some bright sun to heat the panels. What if you live in a condo that is consistently overcast plus gray? I guess it isn’t so efficient in that case plus you would need a backup for heat such as electric heating or something. I will just stick with propane because it has been great to us plus our heating bills are unquestionably low. Every one of us purchased a more modern propane furnace from the local supplier plus are waiting for them to come over to install it. I don’t mess with things love that because I am not licensed plus I don’t love doing anything that involves gas plumbing or electricity. I am better with things including painting plus drywall service as I used to own my own painting supplier for many years. HVAC is a very weird beast though.