I have an electrical hvac system. It's really old and I know it's one for a new one. It's blowing cold air only and I'm just wondering if there is a tune up possible to fix it before plowing forwards with five grand. I changed the filters and I'm not home now so I don't know what model it is. Help!

AC blows cold, that's what it does. Heat? We can't really help you without more info.

Heat on blowing cold air. I have a heat pump system.