If you're a member of Costco, I would suggest getting a quote from them. You could get money back in the form of a Costco gift card:
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We had to have both our furnace and A/C replaced. We went through Costco, had the work done, and got a VERY large return on a Costco gift card. We also upgraded our membership to the Executive level, so we'll be getting an additional 2% Costco "reward".
We are VERY happy with our new HVAC system and the contractor did an outstanding job.
Even if you're not currently a Costco member, it might be worth getting an Executive membership (for at least a year) and a quote on your HVAC needs.
Costco / Lennox HVAC Offer
when we did a whole house generator we used costco to buy the unit but not install. i've heard too many nightmare stories from friends/neighbors about using stores to do installations wherein the stores are using subcontractors. a problem arises and the store says 'deal with the installer', the installer says 'we contract with the store-not with you, deal with the store'

