Is it smart to install a used Carrier AC/Heat roof component on my rental house? In 1998, I bought a new 3 ton Carrier AC/Heat roof unit...

In 1998, I bought a new 3 ton Carrier AC/Heat roof unit and have it installed on my house in Central California. I think it is a 12 SEER. Four years latter I replaced it with a bigger unit (4 ton) because of remodeling. I save the original 3 ton unit and enjoy stored it in my garage ever since. I now enjoy a rental house (in Central California) that needs a new 3 ton roof element. Can I install the old 3 ton Carrier on my rental house? Since it has be stored in a covered garage should I be concerned with any type of deteroriation? I'm thinking adjectives should be well because it has not be out in the elements. How much will it cost to remove the old AC/Heat element from the roof of the rental house and put the used 3 ton Carrier in its place? Will modifications have to be made on the rental house roof, and if so, is that any big business deal expense-wise? Who would do the work? I would like to not have to buy a tentative unit for my rental house since I have the Carrier sitting within my garage.
Keep in mind that this is just my judgment and experience.
My worst nightmare, as a 20 plus year veteran, in residential HVAC is when someone tells me they want our company to install a used piece of equipment. Invariably, the time the part
has been stored creates some predictable issues. Corrosion of relays, wires, carriage or bushing problems,rodents building nest in places that are hard to see, missing parts and a host of other issues.
Now consider that most HVAC companies must carve up their equipment 3-4 times to cover labor and expenses, used is not a good deal. You are going to take-home pay the same amount of labor to have the used equipment installed as the trial. Giving that your carrier is already 10 years old, you will simply be paying for this job again in 3 or 4 years, you do the math.
Plus you will hold no warranty with the old equipment, when it breaks, it's your


I don't see why it would be a problem. Call around to some A/C companies and explain your situation as you enjoy here.

No one here is going to be able to tell you exactly what wants to be done to install the unit without in actual fact looking at it.

Don't expect much of a warranty from the installing company (labor-wise). Make sure that they pull a permit and that an inspector checks the work. With it person a rental property, you don't want to take a chance on unbecoming installation.

Good luck!
Answers:    Nothing wrong with the old section. Unfortunately most a/c companies will want to sell you a new part. So you may need to find an individual who does this kind of work. If you replaced both the inside and outside unit-you are surrounded by luck---otherwise they must match up.
Make lots of phone calls. It can be done.
California pricing is unpredictable.

My brother simply replaced a 3 ton outside unit only within Alabama today, it cost him $2000.00. He knew the contractor. That included the cost of the unit.