Does a new 2 stage HVAC unit need fancy Aprilaire?
We have rec'd quotes on Lennox, Bryant, American Standard, and lastly, Amana HVAC units to replace 30 y/0 Lennox 150,000 BTU (yes, that's right, 150,000) gas furnace and 10 y/o Tempstar 8(?) SEER 5 ton unit for our 2700 sf+ house in North Central Florida.* Are getting quotes for functional 15 SEER units -- for the Lennox, that means a XC21 to deliver 16.3 SEER , Bryant is the Evolution , .** AS dealer encouraging us to get the 14 SEER as he doesn't feel increasing to the 18 really gives a bang for the buck -- about .* Haven't gotten a written quote for Amana, but he estimated a 16 SEER 2-stage at about $.* We are getting local utility rebates so the price of all except the 14 SEER AS would be about $ less than quoted price ( have to have minimal 15 SEER -2 stage for rebate).* All companies have been around area long period of time.* Have used the Lennox company in past for previous house.The Lennox price initially looked good.* However, included in the price is an Aprilaire 4200, surge Kit at breaker box or at AC unit, and a UV light at the coil.* He states that Aprilaire is needed to keep computer board clean for functioning (stated that it only cost $ more), and UV lights to keep mold from growing on coils, since this system would remove so much more moisture from house that there would be an increased growth of mold.* I don't know if he is blowing smoke up the stack with that info.* Other 3 companies said that the Aprilaire, or simular unit would be good, but not necessary.* Also suggested that the UV light was a way to make $$$$$.** Also includes 1 year planned service agreement -- basically 2 visits.* Wonder if he's adding unnecessary accessories?* Lennox also wants to replace 3/8 inch copper in slab to larger 1 1/2 and 1/2 inch thru attic and down exterior wall.* AS and Amana said this isn't needed, but I've read on other sites that there is no effective way to flush R-22 out thru lines in slab when replacing with R410A -- that the mineral oil will get trapped in the dips in the line.I guess I have*3 questions -- do we need a fancy air cleaner to protect the unit (I'm not concerned with air quality in house); are UV lights needed for the coils, and should the current lines in the slab with R-22 be replaced?Thanks -- long post, i realize.
EDIT: NO PRICING
in response to 150,000 BTU furnace
Furnace is original to house being built in 1978, we bought the house 3 years ago. We have had an energy efficiency study done and have more than adequate insulation. There are several other features of the house that were "overdone" -- it wasn't just the furnace! Had the windows replaced last fall as the breeze that went thru the house on a drafty winter day was significant -- however, we still are using 1726 KWH with the house in June with therm at 78 during day, 83 when we leave house. We are hoping to get a reduction in KWH use during summer -- that's the significant change I am seeking, although I know that with proper furnace sizing and an improvement in AFUE we should see some change in the gas bill in winter.
Thanks for the posts regarding the lines and reusing them for 410A after being used for R22 -- I think we'll be having some bids refigured --