Carrier 38TXA SETUP need advise

[mhutchison]

Hello and thank you for reading my request for advise.
I am looking at purchasing a carrier performance 13 and things get confusing in terms of indoor coil and TXV(thermal Expansion Valve).
I have called up several installer and seem to get very different combinations offered.
The outside unit woul be a:
38TXA024 2T
One recommend a larger indoor coil, to a CC5AXA030014 (2.5T Coil).
Most recommend not to install a TXV since the unit is under 3T??

What would be the best combination?
38TXA024 2T + CC5AXA024014 2T OR
38TXA024 2T + CC5AXA024014 2T + TXV OR

38TXA024 2T + CC5AXA030014 2.5T + TXV
Thanks
Regards

[BaldLoonie]

Expansion valve increases the SEER slightly but real benefit is keeping the coil cold in mild weather. If you are in an area where you get warm & humid a lot of the time, you'll get a big benefit from the TXV in terms of humidity control. Personally I'd go with the 024 coil too, oversizing decreases moisture removal slightly. Most on here will agree that it is a wise move.

[mhutchison]

Thanks BaldLoonie for your response.
The season for A/C is shorter here in Ottawa than I would like, but it is always very humid and quite muggy in the summer. If the A/C season was longer, I would go for a much higher SEER rating, but I do want to get the best performance for what I am buying. The TXV adds $200.00 and I do not feel this is too much considering the overall cost.
I will go with the 38TXA024 2T + CC5AXA024014 2T + TXV.

Thanks again.

[Edited by mhutchison on 04-26-2005 at 09:58 AM]

[BaldLoonie]

Then it might make sense to look at lower SEER with a TXV!

[mhutchison]

How much lower in SEER rating should we go with?

[BaldLoonie]

12 SEER with TXV probably similar in price. The energy savings for the 1 point lower SEER would be minimal but the comfort advantage of the TXV would be nice in mild weather.