New HVAC system advice needed

[Partsman41953]

Hello all,

My wife and I live in a 2400 sq foot 2 story home in Columbia, SC and are in need for a new ac/heat pump split system unit. We now have a 15 year old Carrier system, model # 38BYB036300 and would like to know what would be the best system to have installed for our house and what size unit we would need. The system we have now, when it worked, never really cooled or heated the house well. Our air handler is in our attic which get hot so I am not sure if that was the problem or not.

I would appreciate any information on systems that you could provide.

Thanks.

Glenn

[keeplearnin]

find a company tio do a load calculation to start with.

[udarrell]

Hello all,

My wife and I live in a 2400 sq foot 2 story home in Columbia, SC and are in need for a new ac/heat pump split system unit. We now have a 15 year old Carrier system, model # 38BYB036300 and would like to know what would be the best system to have installed for our house and what size unit we would need.

The system we have now, when it worked, never really cooled or heated the house well. Our air handler is in our attic which get hot so I am not sure if that was the problem or not.

I would appreciate any information on systems that you could provide.

Thanks. Glenn

The air handler & duct system being in the attic could be a big part of the performance problem.

Was a load calc ever performed?
How about a Home Energy Efficiency Audit?

What is the heating backup for the heat pump?

Three ton of cooling & 60,000-Btuh of heating should be enabled to handle the loads if you achieve that required level of weatherization & duct system retrofitting. This is just a rough estimate based on the design conditions & a required level of weatherization... Get them to perform auditing & load calc work!

For Columbia, SC. 99% winter design is 50-F.
Summer design at 2.5% is 95 dry bulb & 75-F wet bulb or stopped to figure it 40% RH, 66.9 dew point, 100.4 gr.lb dry air moisture.

By all means get a programmable room stat that has a temp-differential-setting for longer heating & cooling on-runtime-cycles, as this will improve efficiency & help with summer humidity problems.