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Sounds like yet another time the home owner has to follow the contractor and finish the job....they just don't care....
Anyway, yes you have air in the pipes. The air bubble won't push down hill from upstairs. The heat in the basement is probably working the best, no?
If when they built the house they should be vents in your baseboard or radiators, what ever you have at the rest of the house. Some vents are manual, some are auto. Probably manual. If you have baseboard flip up the cover on the end pieces and hopefully you will see a screw type fitting. Get a can to catch water. Chrack the fitting a half a turn or so, don't take it out all the way. There is a bleed hole so you don't have to unscrew totally. Make sure your make up water is on so boil fills after you create more spare in your system.
It is very hard to get all the air out, sometimes it takes time for things to settle. Hope this helps.
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