There is a brand of aircon with cooling/heating feature called General, an india-japanese joint venture. The Sabah dealership disappeared long ago, but the dealer in west malaysia still exists according to their website.

FE Denki Sdn Bhd

Telephone:
+603 5525 5048 (for Sale)
+603 5525 5048 (for service and repair)

I had a unit for 11 years until the compressor died...no spares. On my model the heat function had to be turned on by flicking a switch on the blower unit. It came in handy during colder monsoon months where the daytime temperature could drop below 20C in my area which would make the resins I was working with too brittle to handle.