- Air pollution control equipment and supplies merchant wholesalers
- Air-conditioning equipment (except room units) merchant wholesalers
- Automotive air-conditioners merchant wholesalers
- Baseboard heaters, electric, non-portable, merchant wholesalers
- Central heating equipment, warm-air, merchant wholesalers
- Compressors, air-conditioning, merchant wholesalers
- Condensing units, air-conditioning, merchant wholesalers
- Dust collection equipment merchant wholesalers
- Furnaces, warm air (i.e., forced air), merchant wholesalers
- Heat pumps merchant wholesalers
- Heating equipment, warm air (i.e. forced air), merchant wholesalers
- Heating equipment, warm air (i.e., forced air), merchant wholesalers [2007]
- Humidifiers and dehumidifiers (except portable) merchant wholesalers
- Pollution control equipment, air, merchant wholesalers
- Ventilating equipment and supplies (except household-type fans) merchant wholesalers
- Warm air heating equipment merchant wholesalers
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