u/Biglawlawyering

Realize these questions are both repetitive and covered, but appreciate the assist.

Looking to preemptively replace an almost 40 yr old gas furnace and A/C unit that's struggling. Services the first floor and walkout basement with a bedroom.

Home is 1950's w/ 1990 addition, duct work updated in parts, original in parts. Our mid-Atlantic utility offers some incentive based on seer.

One offer on the table is the Daikin DK-DH7TC-DR96TC/DD96TC for roughly 16k inclusive of incentives.

Just the nomenclature is throwing me. Variable speed blower but not to be confused with variable stage.

(1) Wonder how best to narrow down choices given the home constraints.

Any thoughts, musings, would help this novice out.