...been here in SE Michigan 25 years. I had a new gas forced air furnace/air cond. installed last October. Heated fine all winter. It's cooling fine right now. The issue is the basement. It's finished; large main area, (4 registers/1 large return) ,1/2 bath (1 register), good sized furnace/hobby room (no registers or return), and tv room (2 registers/1 return). There's a door at the TOP of the basement stairs. All the registers in the whole house are wide open. Humidity up and down is comfortable- although a tad higher in the basement when the air doesn't run a lot. The issue is-you'll freeze in the basement! How do I even out the temperature? Shut the basement registers and leave the door open? More return in the basement? I don't know. I'm fairly broke as far as calling the installing company back to "investigate". Anything I might consider? Thanks for the great forum.