Hopefully you can get some use out of these calculators:
Load Calculator: - A
whole house Manual-J load calculator
HVAC Helper: - A
diagnostic aid
BTU- Psychrometric Calculator: -
Calculates properties of air and total system btu's
Superheat Calculator: -
Gives design superheat from outdoor and indoor conditions
These pages were written to make things a little more convenient doing
HVAC work.
Since the internet has become easily accessible to most of us I thought
it would be a good idea to be able to use these programs on any
computer without the need to load any software. Doing whatever research
needed to accomplish the end results taught me an awful lot. The more I
learn the more I find how little I know about the HVAC field.