Hi all, I've been lurking for awhile trying to gain as much knowledge (at least the ability to ask the right questions) as possible before purchasing a system. And I must say, I'm glad I found this forum, it contains a wealth of knowledge. Ok so here goes the details and my few questions...
Home is a 1783 SQFT Tri-level (crawl space) in the Seattle area built in 1981.
13 output Registers
1 Return on 1st floor.
23 Windows (old aluminum double paned)
Front of house faces West.
Currently have central heating using the original electric furnace. The Utility company in the area is offering a very low % conservation loan program to assist homeowners changing over to more cost effective form of heating. The utility company did a heat loss anaylsis for me and then gave me a number of "approved" contractors to give me bids based on the Utility companies calculations, the systems must meet certain requirements, etc..
Heat Loss = 41419 BTU's/hr at design temperature of 20 degrees.
Based on this number can anyone give recommendations on proper sizing? I am concerned with oversizing.
Having difficulty deciding between two contractors (one installs Trane and other installs Carrier). Both Contractors have good reputations in the area although the Trane guy seems more knowledgable (or at least more sure of himself). Here is what they recommend...
Carrier Infinity 16 Series
Outdoor model #25HNA648A003 (4 ton)
Indoor model #FE4ANB00600 (4 ton)
set of Carrier Intelligent heat strips (5,15 KW) model #KFCEH3101C15
Trane XL16i heat pump
Outdoor model #4TWX6036B1 (3 ton)
Indoor model #4TEE3F40A1 (3 ton)
10 kw heat strip
Honewell pro8000 t-stat
I am concerned that the 4 ton is oversized (although the Carrier guy insists that this is the correct size, he states that I spec out for 3.5 tons so because no half tons for the system he rounds up). Also claims since the Infintiy is a "Communicating" variable speed system that the system will automatically adjust down to what is needed while running and therefore will be just as efficient as the smaller 3 ton, but with the capability of 4 ton if needed on those extra cold days.
Trane guy insists that 3 ton is appropriate and 4 ton is too large, claims that that would be a lot of air whipping around for 13 registers and feels duct work might need to be increased in size (affecting overall cost obvisouly).
Utility company tells me that either system falls within their requirements (because they are both 2 stage variable speed systems), but his personal opinion is that the 3 ton would probably operate more efficiently.
Any comments or opinions are much appreciated.
I like both systems. Heating efficiently (lowering my portion of the heating bill) and being comfortable in the winter are my main goals. The A/C is just an added bonus for me as there is only a month maybe two a year which I wish I had A/C.
Any Opinions on Trane Vs. Carrier (for mentioned models)?
Trane has the scroll compressor, Carrier does not. Carrier is a time/temperature defrost cycle, Trans is the other.
Do these 2 facts really make that much of a difference and therefore Trane is the better system?
Is 4 ton oversized?
Is the "intelligent" heat strip (5,15) worth the extra money?
I'm considering adding the electronic filter instead of 4" media filter. Is the cost worth it?
Carrier = carrier electronic air filter
Trane = Honeywell F-300 electronic filter (recommended because Trane guy says it is quiter than Tranes electronic filter).
Thanks in advance,