Heat acclimation sensor will advise you about how much time you required to adopt the hotter environment when the temperature is greater than 22 degrees centigrade, 4 training days are estimated. While height acclimation is known as low consumption of oxygen in hemoglobin at a minimum altitude of 8000 feet. It generally requires one to three days to fully acclimatize the height. Garmin watch uses VO2 MAX data during training to estimate it.