Considering replacing a working furnace...
I'm looking to preemptively replace an ~18 year old natural gas furnace.
House is 102 years old, located in Seattle. Living sqft 3,000, that includes finished basement.
Had attic taken to R49 and dense pack cellulose blown into the exterior walls.
Double hung windows on first floor (~20) are original, single pane. Basement and upstairs are double-pane. House is better sealed than when I got it, but certainly not drum-tight.
I don't think I want an HVAC, space, noise, cost, generally mild summers.
* Looking to contact a well-reviewed Carrier installer in the area. What other brands should I consider?
* Anyone hazard a guess at $$ ballpark for Infinity 98 or 96? Looking at them for the quiet as much as the efficiency, plus slightly better rebates.
* Is something like the Infinity air purifier worth the investment, or one of the step-down models adequate? Or skip it?