My house is located in the Arizona desert where summer temps are 110+. The house is a single story, approx 1500sf, with 10 foot ceilings all the way around. The house has a stucco exterior and was constructed in 1997. How large of a unit is needed? Do I really need a 4 or 5 ton unit or am I getting ripped off? Thanks
click the bullseye and do a load calculation
you know the info about you house
a load cal is the only true way to answer your question
did the company that is installing do a load calc?
ask they may have
if not ask why
it should have been done if you are getting a new a/c
VERY VERY Likely
Originally posted by bennydeez
temps are 110+.
single story, approx 1500sf,
with 10 foot ceilings all the way around.
constructed in 1997.
Do I really need a 4 or 5 ton unit or am I getting ripped off?
It's Not Rocket Science, But It is SCIENCE
with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE
Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities
That sounds like an awful lot for recent construction. The desert is very hot, but there's no humidity. With any size system in that climate, it's imperative that the airflow through the ducts is good- in excess of what is required in any other climate. In most areas 400 cfm per ton is normal; in humid areas, it's more like 350, to help with dehumidification; in the desert, you can't get anywhere near the rated capacity of a system running less thaan 450 cfm/ton.
Putting in a larger tonnage system to get more cooling capacity is going to kill you with utility bills if the ductwork can't handle even more airflow than it's moving now.
First, why don't you tell us why you are replacing the current system? If it worked fine but just croaked and needs replacement, there is no reason to get a system larger than the one you were happy with.
The house was a new purchase for us and this is our first summer. The HVAC company will be back out to do a load test in a few days. The current system has been tested and retested and is working fine but it just cant keep the house cool.