Home we were buying has been vandalized... need air conditioning/heating advice as well as plumbing help!?

Lower the price and obtain a bridge loan for the repairs, HUD has these type of loans. Do not pay a cent out of your pocket. If HUD is too stupid to put a $19 or less a month alarm into a house to protect it shame on them. If they will not immediately amend the contract cancel it and move on; you will get financed for another home.