I've been living in the Pacific Northwest for a decade and we don't do heat here. I hear people complain about something they are calling heat, but it seems that they are just repeating what the T.V. weatherman said because it is just never hot here. Oh well, it is also never cold in the Willamette valley, so my only weather complaint is the fact that we have no weather to complain about.
If you do live with heat, the advise about hydration is solid. Also, avoid overly cooled buildings. If there is a temperature difference greater than ten degrees between indoors and outside you are playing with fire.