Probably a dumb question. I am just recovering from blood clots in my lungs and also suffer from asthma and congestive heart failure. I was beginning to be able to get around slowly again. But the last month, has been crappy. They are now blaming my lungs. (The doctors argue.) My question, however, is...it is 107 out here in Phoenix right now. I decided to go over to the mailbox. Not even 1/2 mile. Probably not even 1/4. Anyway, I did that, came back and I feel terrible. Does the heat bother others with CHF (diastolic dsyfunction) and/or asthma? I've been back in the air conditioning for over 1/2 hour and I'm still pouring sweat.