Reno'ing a 2 unit house in NE USA, 3300 sqft~

Gut rehab, all new MEP and interiors except floors.

Going all-electric. HVAC to be 3x condensers (1 per floor). One air handler in basement, two in attic space, with the entire system being ducted, or if somehow my installer convinces me, all ducted with exception of wall units in 3 of the bedrooms.

Going for state and federal tax credits, my state has list of approved equipment. I'm going with Mitsubishi hyper-heat for the low temp performance. Even though it should be fine even w 0F winters they quoted resistive backup heaters for the air handlers. State is going to get more strict about what equipment meets their criteria in 2024, I'm getting in under the gun.