Whether you Sherbrooke, Granby, Cowansville, Magog , Drummondville, St- Hyacinthe or elsewhere in the Eastern Townships , Montérégie and Centre-du -Québec , GNR Corbus offers the professionals and services the following products : Commercial / Industrial / Institutional : refrigeration , air Conditioning , heating geothermal , ventilation , natural gas , Plumbing Residential geothermal , central system unit heating and air conditioning wall heat air conditioning , air exchanger , humidifier , underfloor heating connecting gas appliances more... See more text