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Question:

Please help to choose furnace and A/C, thank you!?

I have quotes for replacement of A/C and Furnace, prices include tax and installation. All motors have variable speedFurnace:Rheem-Prestige Series 90, model RGFD 92%. with lifetime heat exchanger unit replacement warranty, 10 years on labor and parts, 90,000 BTU: $4200Lennox-G61V 94.3%, 90,000 BTU, lifetime warranty of heat exchanger, 10 year parts, 2 year labor: $3850Carrier-Infinity 96.6%, 100,000 BTU, lifetime warranty of heat exchanger, 5 year parts and labor: $4000A/C (3 tons)Amana-ASX14, 14 seer, 10 year part labor warranty, lifetime unit replacement on compressor: $3450Lennox-Elite Series XC14, 14 seer. 5 year part, 2 year labor and 10 year compressor warranty: $3150Carrier-comfort series, 14 seer. 5 year part and labor warranty, 10 year compressor warranty: $3500Which ones are the best choices of A/Cs and furnaces with the price and warranty that they offer. Thank you for your advices!!

Answer:

amana furnaces have a lifetime heat exchanger warranty also. 14 seer amanas use puron and you cant beat the unit replacement on the compressors. goodman has the same warranties as amana,except for the heat exchangers and they re made from the same manufacturer, but they re a tad cheaper in price. i service many furnaces and a/c s. many have the same compressors, contactors and capacitors on ac s. the difference is furnaces.different eff. ratings and different kinds of heat exchangers mean alot. 95 %is about the best you ll get in efficiantcy.
i am a 30 year vet in this feild. go with the rheem best warrenty best performance and energy eff it will last you 20 years.
I would purchase a Carrier unit. If it is using Puron, this will be the new refrigerant all are aiming towards. Carrier (which is made by the same company who makes Bryant) , in my opinion, is a far better brand than Rheem. Also, if these are all offered by different companies, please make sure the company you chose has been in business for a while. It's easy to start a company in this business as you will see many pop up in the summertime. After the rush, many cannot remain open due to the slow season.
I like Carrier over Rheem or Lennox. I do question the 100,000 BTUs or even 90,000 BTUs though. Very large house or very cold climate maybe? Note: That figure is INPUT. Sometimes the estimators get lazy and put in the same BTUs that were there without considering you went UP in efficiency. I have serviced many replacement furnaces that were overheating as a result of this. If you had a 100k BTU furnace there before likely this one is too big at 96.6% efficient when the old one could have anywhere from 65% to 80% efficient. On some new ones that were two stage, heated on two different levels, I have had to lock then in to the low. Or on a few remove a burner because they replaced the unit with the same BTU *input* but the newer ones had a higher BTU *output* due to higher efficiency. I would almost bet you need a smaller furnace because the ductwork is not designed for one that big at that efficiency. It won't be able to remove the heat that fast. Overheating lowers efficiency, more heat goes up the stack, can crack heat exchangers, and generally causes service problems like short cycling on and off. And it is very hard to address once the unit is there. More is not always better. The heat produced has to match the ductwork's ability to move it out. Good Luck Ps. You usually will find the BTU input for the old furnace marked on the model number plate.

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