When I installed my Nest thermostat it was blowing hot air instead of cold. This was because my old thermostat had 'conventional' and 'heat pump' labels on the terminals and I chose the incorrect one. My system is a heat pump so when I rewired it the correct way it fixed it. To tell if your system is a heat pump or conventional- if turning on the heat causes the condenser outside to kick on, that means it is a heat pump.
link to compatibility checker tool on Nest's site :
nest.com/support/article/My-o...
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