Sorry for the long post but I wanted to provide as much info as possible.
Iíve been reading these boards for a month or so planning a new system this spring and this has to be one of the most knowledgeable forms on any topic Iíve seen on the Internet.
Iím hoping someone can give me some feedback on a new system (AC and Furnace).
First a little background. We live in Denver, CO so removing humidity will never be an issue; the humidity is very low even in the summer.
Our house is a 2100 Sq Foot ranch with a 2000 sq foot finished walk out basement (the basement is not an issue as it stays a reasonable temperature year round with our current system).
The major issue we have is keeping the main level at a reasonable (~72 degree) temperature from about April Ė October, if itís 85 outside we can not keep the house below ~78 inside and thatís with the current AC running ~15 hours a day (it does not cycle on and off or freeze up). The back of our house faces directly east and is basically a wall of windows along the entire east side (we have tinted all of the east facing windows with a quality (fairly dark) tint and that helped a bit). Adding to the issue is the fact that the roof is black and being a ranch has a much larger roof than a similar sized two story. We also have 25í vaulted ceilings throughout most of the house.
We have 7 air returns throughout the house and 14 registers.
Heating the house is not a problem; itís currently 34 and snowing outside and the main level is at 70 and thatís without running the furnace at all today. The furnace doesnít need to run much due to the amount of heat from the windows and the roof.
We currently have the equipment that was installed by the builder when the house was new (10 years ago).
Furnace - Trane TUE120A960K2 (120K BTU???).
AC - Trane 4 ton (I donít have the exact model handy)
Coil - ADP HA05248C245B200584.
Weíve owned the house for four years and weíve finally given up on the current AC, weíve had 4 different local companies out over the last 4 years to try and resolve the issues but things have not gotten any better. Every thing has been cleaned, adjusted, tested, etc.
The current quote Iím thinking of going with is the following Ė Any advice would be greatly appreciated. (the company did a load calc which called for a smaller system than we have today Itís hard for me to believe that would work with what weíve experienced).
58CVA110122 (is this reasonable for this size house?)
CNPVP6024ACA (Iíve read that the ATA is an update to the ACA, is that correct and should I request ATA)
Infinity Air Purifier
Steam Humidifier (donít know the model yet)
I was hoping to qualify for the Tax Credit but it doesnít look like the Carrier 5 ton will meet the 13 EER requirement. If you know some way to design the system to meet SEER/EER Iíd love to hear that advice as well. It also didnít look like the larger furnace would meet the 95% requirement for furnaces. If I can't make the tax credit I was thinking of just going with the 17 SEER model.
Thanks in advance.