[pvoosen]

Heat will shift the curve. When it is hotter your heart will beat faster in order to help cool you off. AeT will be affected by a lot of factors, temperature, elevation, time of day, nutrition, etc. If you want to get a more accurate measure of AeT it would probably be best to perfrom a heart rate drift test on a track during “normal” summer weather, or you could just run based on effort for the time being.