Furnace Replacement help

[yankeeclipper781]

Hello,

765 sf condo, 3 rooms with supply air. Gas. One exterior wall. Fireplace. 1st floor furnace in closet current furnace is 50k/75k input and takes a 14"x25"x1" filter. Central air. AC unit Rheem Classic Series 2005; RAKB-024JAZ. Ceiling ducts.

80% efficient. 95% poses some installations concerns with venting. Ground floor unit with concrete slab on grade with another resident above me.

I have estimates to install the below units from local contractors:

Carrier Infinity 80 (58CVA070)
Rheem Prestige Series™ Super Quiet 80 RGPE-05EBMKR
Lennox Merit High Efficiency Blower (ML180UH045E36A)
Armstrong Air (A80UH1E045A12)
York LX Series Model: TG8S040

I am very confused as to what is the best one for my home. The furnace will be installed in a very small closet between my living and dining rooms. My primary concern is noise and requestd pricing for queter units. I didn't request pricing for the York but the cost to install is nearly $ less than the Carrier. What unit should I select for my home? Please help me decide. Thank you!!!

[BaldLoonie]

70,000 btu furnace for 700 sq ft condo sounds NUTS.

Rheem's 80s have the solid front so usually will prove the quietest. The RGPE with 2 stage thermostat or the matching communicating control would be a nice system.

The Lennox and Armstrong furnaces are similar, single stage with conventional motor. York too, it's a low end builder model. They aren't in the same league as the CVA or RPGE.

[catmanacman]

Mabey a heat pump with a 5 kw supplemental heat strip

[54regcab]

For a closet install the blower is what will create the most noise since the blower is typically "unshielded" from the return grille. heat pump, or hydronic heat that runs off a gas water heater would be quieter. First company makes hydroair units.
http://www.firstco.com/products/aqua_therm.asp

[yankeeclipper781]

Thank you for your replies.

A hydroair unit is not an option. The hot water heaters are in a central area of the building. Currently there is no plumbing near the furnace.

I am open to other options if the models that the contractors provided are not viable options. I am concerned the Carrier two stage furnace is oversized for my home. The Lennox contractor advised against them.

[syndicated]

I agree the carrier is too big. But 2 stage is a nice feature.
I would ask the Lennox guy why he didn't quote you a G60V
Go with a furnace with a variable speed blower, they tend to be quieter than a PSC blower.
Also, look into the warranty offered on all those models. You might pay a touch more, but I guarantee it'll be cheaper than a repair!

[54regcab]

45k is plenty of heat, i wouldnt buy any bigger than that.

[tedkidd]

Mabey a heat pump with a 5 kw supplemental heat strip

Or inverter driven mini splits. Zone control and 1/2 the energy bill.

Get rid of gas meter and save $15-20 mo just for meter charge.

[jtrammel]

I like the York furnace or you could go up to the Tm9v furnace. I also like the idea of a heat pump

[54regcab]

Or inverter driven mini splits. Zone control and 1/2 the energy bill.

Get rid of gas meter and save $15-20 mo just for meter charge.

This is a VERY valid point for low load homes. In our area the meter fee is $27/mo !!!

[yankeeclipper781]

I had the contractor for Carrier submit a quote for a lower BTU model. He did for model 58STA045 and called Comfort 80. On the Carrier website it's referred to as Base 80. Is there any difference between this model and Comfort 80 58DLA or 58DLX models? I don't see one. I am leaning towards Carrier for the Quiet Tech Noise Reduction System.

I also looked at Lennox G50 models but the reviews seem to be poor.

Thoughts??? I am hoping to make a decision this week. The nights are getting colder.

Thank you so much for your assistance!!

[tedkidd]

So you didn't explore the heat pump or mini split heat pump, yet you are asking for thoughts? On what, manufacturer?

If you are buying a cheap ford or a cheap Chevy, think there is significant difference?

45,000 is likely x2 the output you'll need ON THE COLDEST DAY. So on an AVERAGE day it's oversized bu a factor of 3-5x. Installing a gas furnace, from the information you've provided, could be big missed opportunity and long term a regretted, costly mistake. Your energy bills and comfort will tell.

I have 1800 sf mobile homes, not only no protection from cold on either side, but no protection underneath, that heat with 40,000 btu, un upstate NY.

You could put in electric baseboard and the bills would be less under the mismatched conditions you describe.

[yankeeclipper781]

Thank you for your input. I researched the heat pumps and was told that my 5 year old AC unit would be tossed along with the 30 year old furnace. The install cost would be nearly 1.5 to 2 times the cost of replacing the current furnace with something similar. I don't have the funds at this time for a rehall of the entire HVAC system.

On a side note - My heating costs have been very low with a 30 year old furnace. I have only one exterior wall and a unit above me. No basement - Slab on grade. I've been told a newer 80% furnace will be more energy efficient than what I have now.