I had a house built in 2013, guess who designed it, wired it, installed the boiler, ran the tubing, hot water heater, kitchen etc. It's a pretty cheap proposition when someone else can dig the basement, build the blocks, frame, roof, sidings, windows, insulation, drywall and you take it from there, now once again, your expertise is what?
one would think that if you dug the basement you would have also installed a geo
thermal heat pump thereby reducing your heating and cooling costs by nearly 80%
the major expense to a geothermal heat pump is digging the area to bury the lines and if you had the equipment and the know how to dig your own area then the cost to install would be far less than the boiler
with a boiler you do not get the air conditioning aspect
but of course you already knew that...