- Aeroclub
- Air conditioning contractor
- Audio visual equipment repair service
- Air compressor repair service
- Air conditioning repair service
- Aluminum supplier
- Appraiser
- Accounting
- Association or organization
- Appliance parts supplier
- Aluminum frames supplier
- Apartment building
- Animation studio
- Auto air conditioning service
- Air conditioning system supplier
- Air duct cleaning service
- Air conditioning store
- Audiovisual equipment rental service
- Air compressor supplier
- Auto electrical service