Beazley
If you can afford it, join ASHRAE. It doesn't cost much and you get a lot in return. Each year you get a new Guide which are excellent. They cover just about everything you should ever need.
I am an ASHRAE and CIBSE member (UK based), but the ASHRAE membership is really good value and if I ever need any specialised technical info, I go to ASHRAE for it.
Friar Tuck of Sherwood