Here you will find lots of surprise fun (mandated sewer projects; 40 year old furnaces or frozen and cracked radiators connected to burnt - out boilers; single - pane wood frame windows in snow country; inadequate or completely missing or worse, outdated insulation; gutters broken by ice damns; etc.) but you also get the added challenge of really tight margins between purchase and sales price coupled with severely limited number of qualified and interested buyers. (biggerpockets.com)
Older furnaces operate at about 60 % efficiency, which means for every dollar you spend about 40 cents goes straight up the chimney. (moneysense.ca)
For older furnaces, schedule annual inspections but pay attention to what's covered. (moneysense.ca)