Do I need a new thermostat

This weekend my clutch on my a/c froze up, so I took to a place and had the compressor disconnected via the fuse box, my heat was working up until then now all that blows out is cold air, any suggestions?

they probably pulled the fuse that also opperates the blend door - put the fuse back in and unplug the a/c compressor clutch under the hood