View Full Version : Carrier vs Lennox-Dog and wife about to leave me...
07-25-2009, 10:50 PM
Our 20yr old Trane in central Florida has died and I need to pull the trigger. From the reps that visited we have narrowed it to 2 options.
1) Carrier outdoor 24ACB648A30, furnace 58CVA135, coil CNPV6024A
2) Lennox outdoor XC21-048, furnace G600HV-60C-090, coil CH33-48C-2F
I am concerned that the Carrier appears to have a 5 ton coil and a very large furnace with a 4 ton outdoor unit but it seems to be matched on the Carrier literature. I realise this system has been selected to get the tax credit but is this going to lead to future problems? Will de humidifying be a problem? - it is pretty steamy here. Will it blow the existing ducts?
The Lennox is more expensive but is it a better option?
Thanks for any help.....
07-25-2009, 11:36 PM
What size is your existing equipment ?
Were you satisfied with the operation of heat and cool ?
Has either contractor done a heat loss heat gain calculation ? If not, call someone that will.
. Get the manual j done and then see if your ducts are sized properly..
07-26-2009, 12:10 AM
Have you discussed your concerns with the Carrier dealer. Some units go with larger coil to get higher seer but there are other ways to achieve this. Do you need or will you use the tax credit? Living in central Florida have you considered getting a heat pump instead of staying with furnace. Price is usually close to same even with additional 230v electricla for air handler.
07-26-2009, 09:43 AM
Thanks for the replies. Existing equipment is 4 ton and we did not notice problems with it. All 4 companies that visited were selected because they are factory authorized dealers with good BBB records. 1 company did the heat loss gain calc. and agreed with 4 tons. I have not discussed my Carrier concerns with the dealer yet. I wanted some unbiased opinions. We would like to get the tax credit - both the options seem to - but I do not want to jeopardize the operation or effectiveness of the system just to get a tax credit.
07-26-2009, 09:46 AM
1 company did the heat loss gain calc. and agreed with 4 tons.
Not sure if the carrier is a 5 ton condenser but if it is you have your answer.
tinknocker service tech
07-26-2009, 10:06 AM
One did a load calc and confirmed your size unit. You have most of you answer right there.
brand doesnt mater in any way shape or form contractor ans instalation does.
07-26-2009, 10:26 AM
The carrier unit is a 16 seer dual capacity unit using the bristol ts compressor. The oversized coil is for the tax credit qualification. Install the infinity control to control the humidity and it will control humidty levels.
I don't think I'd buy a furnace that is so oversize.
07-26-2009, 11:04 AM
Once again thanks for your valued replies. I believe the Carrier condenser is a 4 ton Comfort series unit and would not operate with the infinity controls. If I go up to the Infinity system throughout, the price vaults over the Lennox. The Carrier dealer was working hard to get a good price combination coupled with the tax benefit but the result is a 4 ton condenser, 5 ton coil and larger furnace. I have read a lot of posts on this forum and I believe the system can be adjusted so that is compatible - and Carrier posts this combination on their website - but is it the wisest option ?
07-26-2009, 11:38 AM
Willserve suggests going with a heat pump & Dash also appears to imply it.
I would think FL would be heat pump winter design temps, FL's winter design temps are not even listed in my manual.
I would think you could do a number of things to bring the heat-gain load-calc down so a 4-ton would handle the load, and dehumidify your home.
You have around 2400 to 2600 seasonal cooling run hours there in FL; you need to keep operational costs as low as possible.
I'd Run some weatherization options (e.g., lower the air-infiltration rate, among many, etc.) & see what tonnage you'll come up with.:)
07-26-2009, 12:27 PM
if the humidity level in your area averages over 55%, don't get the bigger coil
07-26-2009, 12:38 PM
None of the contractor's who visited recommended the heat pump option. We have gas heating which has cost effective rates in our area and the heat gets relatively little use on an annual basis. I believe the 4 ton unit is adequate and the contractor who ran a calc. agreed. The upsizing of the coil and furnace on the Carrier is to get the tax benefit in the pricing. Thanks for your continued help.
07-27-2009, 09:34 AM
Hitting the specs for tax qualifying HP is tuff if not impossible in the 4 ton range. The furnace seems grossly over sized for your local and in effect, is just a huge air handler. To hit the matched system that qualifies with that coil and required airflow is the reason. Since the tax credit is not all that much in the grand scheme of things, maybe exploring other equipment combinations is the answer. You most likely will be able to get high eff equipment at a lower cost so while it won't be a qualifying matched system as far as the tax credit, the money saved may well offset the money lost to the credit. Try going with a 95% furnace that qualifies coupled with and AC system that does not, or even a non-qualifying HP coupled with the 95 % furnace. You will still get the credit for the furnace by itself.
07-27-2009, 10:36 AM
Thankyou all for the straight shooting advice. We are going back to the drawing board. You have verified our concerns with the Carrier option and we are steering away from that.
07-27-2009, 11:43 AM
I'd inquire about using a Carrier 58CVA090-14 furnace. It has a 4-ton blower motor, but the furnace is much smaller at 90k btu input. Probably still oversized, but not to the degree the 58CVA135 would be.
07-27-2009, 07:12 PM
I don't think that Lennox match up you listed will make the tax credit either. Looks like 17.2 SEER and 12.70 EER.
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