If they also sell air conditioning units then maybe
shop=hvac (used 34 times in OSM already
https://taginfo.openstreetmap.org/search?q=shop%3Dhvac)
repair=yes
This would be similar to tagging for a computer shop,
http://wiki.openstreetmap.org/wiki/Tag:shop%3Dcomputer
David
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I have encountered a mistagged air conditioning service center around
Batangas City, added via MAPS.ME, and I retagged it with craft=hvac and
shop=trade. But the Philippines tagging conventions (
https://wiki.openstreetmap.org/wiki/Philippines/Mapping_conventions) has no
recommended tagging for
