80% Furnace vs. 90% Furnace; requires side wall venting


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Old 05-31-18, 08:30 PM
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80% Furnace vs. 90% Furnace; requires side wall venting

I'm having heat/AC replaced. My furnace installation needs side wall venting. What's the better option in terms of cost and reliability...
80% Furnace with side wall power venter/damper, or 90% Furnace without the power venter/damper?
I appreciate anyone's opinion...
 
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Old 05-31-18, 09:22 PM
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I would definitely pick the 90% if I needed side wall venting.

This far south we do not install many 90% furnaces unless it is an Icynene home or the furnace is in a basement in River Oaks.

The 90% seems like it would be more reliable of your 2 options.
 
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Old 06-01-18, 05:30 AM
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With an 80% furnace with a side wall vent don't you still have to treat it like a chimney? Double walled and when outside needs to rise above roof line?
 
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Old 06-01-18, 03:20 PM
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Thanks a lot Houston204 for your reply.
Does anyone know how the costs of these 2 options compare?
 
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Old 06-01-18, 03:23 PM
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I don't know Astuff. There are 2 stories above me, so going out the side wall is the only option.
 
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Old 06-01-18, 03:32 PM
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I accidentally posted the same reply twice. Does anyone know if there is a way to delete a post?
 
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Old 06-13-18, 07:37 AM
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80% is pretty much obsolete in heating dominant climates.

Even if you could vent through the roof it would be a dumb idea to put mid efficiency anywhere the heating season is more than 2 months.

We don't have them in canada anymore, but we don't put furnaces in attics or garages where there's a risk of freezing condensate.

Reliability is about the same for 90% as is for 80%. They have the same controls - using the same circuit board, main blower motor, etc.
 
 

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