I recently finished my basement and I have about 1000-1100 ft2 that I would like add HVAC to. My question is:
Would I run into any major issues with adding two registers (and an equal sized return) for the basement off of my 3 ton AC/ 55,000 BTU/hr furnace, that currently services the 1st floor at around 1300 ft2 ?
It has two way trunk lines and I'd add a branch to each trunk for each register. The branches would be very close (if not 1st branches) off of the trunk lines and run for maybe 4 or 5 ft, max. I also keep two registers closed on the 1st floor. Also, tips on branch size would be helpful as well. I was thinking 4 or 6 in?
The temperature in the basement is very stable, just stays a bit too hot in the summer (now) at 73 - 74 F. Current AC/heat runs fine on the 1st and 2nd floors. I was hoping to steal a bit from the first floor to knock the temp down a degree. Perhaps I could install the registers and if it overworks my current set up, disconnect them and seal the ducts and go minisplit?