PLANNING RANGE, NOT MANUAL J
What HVAC size should your contractor investigate?
Screen a broad cooling-capacity band from home facts, then compare it with the proposed tonnage and require an address-specific residential load calculation.
Check the planning range →WHY OVERSIZING MATTERS
Bigger equipment is not automatically safer.
Oversizing can increase cycling, weaken humidity control and create comfort problems. Undersizing can miss design-load needs. A contractor should document Manual J assumptions, duct capacity and the selected system’s sensible and latent performance.