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Old 05-20-2008, 10:22 AM   #1
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Location: Ottawa Ontario Canada
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upgrading furnace and AC


We have a 20yr old natural gas furnace (Lennox) and AC (also Lennox). It was described as mid efficiency when purchased with house from builder in '88. It has conventional chimney.

I intend to request suppliers to provide some quotes for replacement. This request is to get some pertinent info as to what exactly I should be asking.

I'd like to replace with high efficiency gas (90+%), and the associated "plastic vents"/chimney. I do have a rental HW tank (gas) that I'll continue to have, but not sure how HW chimney would fit in all of this)

My thinking is for supplier to include costs for

*new furnace
(I'd like air filter; humidity controller;--anything else here?)
*programmable thermostat
*variable speed high efficiency fan/blower (ECM motor for fan)
*new AC
*removal of old furnace and AC
*new chimney/vents
*connection for any water/humidity overflow from AC
*connection for any water from condensing heat exchanger
*warranty period (preferably 10 yr)

I look forward to comments and experiences that could be used in my request.
Anyone have suggestions/comments?
Thanks in advance.


Last edited by orange; 05-21-2008 at 09:04 AM. Reason: typo
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Old 07-19-2008, 09:36 AM   #2
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upgrading furnace and AC


sometimes people will install furnace and AC at two different times for financial reasons. if this is so, install the furnace first and at that time ask them to also install the coil for the AC (this part goes in the air duct in furnace for cooling).

and get one quote for the entire job (furnace & ac) but ask them to delay payment of ac until that job is done a year later.

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Old 07-19-2008, 07:03 PM   #3
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upgrading furnace and AC


If you have made any energy efficiency improvements on the house such as increased insulation, weatherstripping or new windows be sure to request the supplier do a complete heat loss / heat gain calculation.

Request a two-stage furnace.

Request a ductwork evaluation, including any necessary sealing and insulation of ductwork.

Request the thermostat have full seven-day programmability, has two stages of heating and has an "adaptive recovery" subroutine.
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