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Old 10-07-2009, 12:49 PM   #16
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lennox conservator g11e problem


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Originally Posted by hvac122 View Post
Now to the next step. How did they come to the conclusion as to what size system you need? Did they perform a manual J load calc? If they just guessed from sq footage or old equipment size then you will not be sized properly.
i think they just went off sq ft of my house which is about 2100sq ft including basement. The first company is a small family operated business that i have known the family for about 30 years. They are really small and only have family working there but have been in business for a long time. Tomorrow i have another company coming out, and see what they have to offer.

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Old 10-07-2009, 01:50 PM   #17
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100,000 90% furnace for only 2100 including basement. Thats a bit over sized. Unless your winter temps are in the -30F range.

Or you have no insulation, and mostly windows for walls.
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Old 10-07-2009, 04:13 PM   #18
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Around here those Duracurve heat exchangers have a nickname, Duracrack.

Have a heat load calc done. A system that is properly will provide the most comfort.
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Old 10-08-2009, 01:14 AM   #19
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so is a heat pump and gas furnace better than a gas furnace and regular central air? Will the heat pump be better in the summer for cooling and then as i understand, the heat pump will also produce heat down to a certain temperature so the gas furnace does not have to run? the tech also said that he could add a humidifier to the system for an additional $225..are these really worth it?

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Old 10-08-2009, 04:51 AM   #20
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Dual fuel/hybird(heat pump with gas or oil furnace) systems do save you on your heating cost.

As far as cooling. A heat pump or straight A/C, cool about the same.

How dry was your house last winter. That will determine if a humidifier is worth having or not.
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Old 10-08-2009, 09:39 AM   #21
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pretty dry, i also have a wood burning stove in the addition on my house which makes it especially dry in that area.
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Old 10-08-2009, 10:50 AM   #22
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i had the 2nd company come out today, he took measurments and notes and is going back to his shop to do a load calc. He also recommended the heat pump/gas furnace. He also stated that i only needed an 80% furnace because of the time it is actually used but i thought 90% would be better. Am i wrong in this aspect? He is supposed to have me an estimate by the end of the day so just waiting now...
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Old 10-08-2009, 11:25 AM   #23
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A 90% will help your resell value much more then an 80%.
So even if you don't use the furnace much. It is still better to go with a 90%+, then an 80%.

You never know if a buyer 10 years from now will use the wood stove.


Most of your dryness comes from using the wood stove. If its combustion air is taken from the house.
It takes a good humidifier to overcome the amount of fresh air a wood stove needs for combustion.

In your application. If the wood stove combustion air comes from the house. A steam humidifier would work better.
An EWC S2020 would be a good choice. Its expensive, but can add 22 gallons of water to the air a day.
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Old 10-09-2009, 01:24 AM   #24
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since i am going to replace my furnace with something, are these johnson modules worth anything since they are so common to go bad and hard to find? that part of the furnace works great!
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Old 10-09-2009, 03:19 AM   #25
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In your application. If the wood stove combustion air comes from the house. A steam humidifier would work better.
An EWC S2020 would be a good choice. Its expensive, but can add 22 gallons of water to the air a day.[/quote]
yes, those are expensive!

so would it be worth it at all to get the add on humidifier for the furnace? i think he said he uses aprilaire humidifiers, around $225 installed

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Old 10-09-2009, 04:46 AM   #26
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That Johnson control isn't really hard to get.

You would probably need an Aprilaire 700 connected to the hot water line. If you want to get near enough moisture in the air.

But I doubt it would be enough while your burning wood, to get close to the humidity you would want. But would be better then not having a humidifier.
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Old 10-11-2009, 10:01 PM   #27
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i am supposed to get my new furnace and heat pump installed on wednesday. I am getting and american standard 90+ gas furnace and 13 seer heat pump. I would like to go better seer heat pump but unfortunately my budget will not allow for it. i got several quotes, 2 from 1 campany.
here is the quotes i got from one company using american standard contemporary furnace and allegiance ac unit. they also did a load test.

13 seer ac unit 30000(not heat pump) 92% 80000btu furnace(gas) and honeywell thermo. $7148 installed
(claims 12% gas reduction and 38% air conditioning savings.

15 seer heat pump, 30000 80% 100000 btu variable speed 2 stage furnace digital thermo. $8940 installed
claims 52% electricity reduction and 60% gas reduction.

I also got a quote for 100000 btu 90+ and 13 seer heat pump using rheem equipment for around $6500 installed

I have a friend in the business that also uses american standard equipment that i was able to get ahold of. He is a very small family owned business that gave me a great deal so i am having him do it. Using the same furnace from quote 1 100000btu 90+ furnace and a 13 seer heritage heat pump along with touchscreen thermo for $4500 installed. He said he can also add in the aprilaire 600a humidifier for around $250. i am going to ask about the difference in price of the 700.

I am not going just for the cheapest price, its just what i can afford to do at this time...(medical bills really suck)..I just hope i am making a smart choice for my family and home. I really appreciate the help all of you have given me. Its great to be able to get opinions from people not trying to get my money.

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Old 10-12-2009, 04:32 AM   #28
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Was your old furnace 100,000 BTU.
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Old 10-12-2009, 10:08 AM   #29
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yes it is
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Old 10-12-2009, 11:33 AM   #30
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Get more estimates.
Do your own load calc HVAC Calc.

Newer furnaces require far more air flow then older ones did.
Your duct system is probably under sized. And a 100,000BTU 90% will probably end up tripping on its high limit. Or, you'll end up with lots of noise from your duct system.

You may only need a 60,000BTU 90%. So a load calc can save you money up front with a smaller furnace that cost less. And saving on gas consumption.

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