Basement air return

Hi, I am finishing up my basement and I'm planning to put and air return on three rooms that ived built on my basement, will it be okay if I just tap right on my air return duct and put a grill on it just like some people said or do I need to hook up a connnection from my air return duct going to...

Hello, My house is just over 4 years old and I have had problems balancing the air on the main level from the time I bought it. One room will be 8 degrees different from another. I also have an unfinished basement where I have had moister problems since I bought it. No leaks but a lot of...

My home is new construction; 2 story with a basement. I have a 2 ton HVAC unit. I am finishing the basement and have installed a supply branch with diffuser in the ceiling. That is one 6" branch off of the main supply to a 500 sq ft rec area. I would like to add a second and also a cold air...

How far from the furnace should I install a cold air return in my newly renovated basement? Another question: I just installed a new high efficient furnace with a fresh intake on it from outside, in an existing house. Any need to invest in an HRV air exchanger with an additional fresh air intake...

Carrier, modal 58MAC120-20, direct air forced air furnace, seven years old in a 2,700 square foot home seven yaers old. The basement is 1,200 square feet, open and half finished, has two supply air regesters and no return air vent. What size "opening" is recommended for this area?