If you are looking to find cheap heating and air conditioning equipment one place to start looking is at local thrift shops for portable heating and air conditioning things.
I have found perfectly working portable space heaters and portable space heaters in thrift shops for dirt cheap.
Also another place to try to find cheap heating and air conditioning equipment is by looking at wholesalers online. You could actually find a brand new and somewhat up to date central heating and air conditioning system unit for way cheaper than you would get it going into a heating and cooling dealership. It really is a bunch of luck to be honest. But those are two examples of how you can find cheap heating and air conditioning equipment. I actually bought my central heating and air conditioning system this way. I was able to get a brand new and somewhat up to date central heating and air conditioning system unit from a wholesaler. They had it shipped to me by freight which cost a few bucks, but the offset in price that still made it cheap was that they offered free heating and air conditioning installation from their own wholesale company. So that part was nice and it worked out real well. The heating and air conditioning specialists that they had there to send out to do the heating and air conditioning installation were very professional as if they came from the local heating and cooling company near me.