T the upstairs is a 3 1/2 ton 10.0 SEER condenser, and the downstairs is a 2 1/2 ton 10.0 SEER condenser. You can use any 10 SEER Unit on replacement, but if you go any higher in SEER (efficiency), there is a possibility the unit will freeze up. The reason is because the indoor coil also has an efficiency rating (10.0 SEER). It is not a good idea to mismatch units when it comes to SEER. Otherwise, you can use any brand of unit, if you want to go higher in efficiency, you need to change the indoor coil as well. Hope this helps. Mark
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So I imagine this indoor coil is located in the units in the attic? Is this a pricey endeavor to change the coils inside the home? Also is it ok to get a larger unit? Say a 5 ton but still maintain the SEER of 10? Thanks again.
Hi T,
Yes, the indoor coils will be just in front of the heater in your attic. You can find them by tracing the 2 lines of copper tubing that are coming from the outdoor unit. The copper lines connect directly to the indoor coils. I just replaced a coil for a church here in Okla. and it is going to be about 1500.00. ( I know you probably just fainted)
If you have an installer in mind, sometimes you can find an 11.0 SEER unit that will work on a 10.0 SEER coil. I have seen 12.0 SEER units on a 10.0 SEER coil and have seen them work fine. Keep in mind though, if you put any higher eff. outdoor unit on a low eff. 10.0 SEER coil, you will still get the LOWER efficiency out of the unit. The lowest eff. I can buy here is now 13 SEER. Even though I am retired from the hvac field now, I am pretty sure most manufacturers will not warranty a 13 SEER unit on a 10 SEER coil. Hope this helps a little more. I buy stuff on Craigs all the time. I have outdoor units stolen every year on my rentals so I'm always looking. You might start looking now, but the best time to buy an air cond is definitely in the winter. God Bless.
Are you kidding me? your looking for used air conditioning equipment? That's like using a spent prophylactic.
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