We are planning to retrofit Central Air (a 4 ton system) in our 2100 sqft house. The house has 3 bedrooms in the second floor with two bathrooms (not huge - 4 ft x 6 ft), one office room (5ft x 6 ft) and a hallway. The contractor said he will install the return in the hallway and three registers in each bedroom. I'm debating on installing the registers in the bathrooms, closet and the hallway too.
Also the duct works will run through the closets and serve the first floor - living room, family room, kitchen and dining room.
The contractor is suggesting - no need to install in bathrooms, closet and hallway as it will be freezing. Please advice.