| Business | Phone |
| Madison Heating & Cooling Inc 1208 E 11 Mile Rd, Royal Oak 48067 | (248) 546-0101 |
| B & L Heating 1212 Royal Ave, Royal Oak 48073 | (248) 288-3150 |
| Royal Oak Heating & Cooling 728 E 11 Mile Rd, Royal Oak 48067 | (248) 542-9353 |
| Delta Heating & Cooling 2628 Glenwood Rd, Royal Oak 48073 | (248) 549-3377 |
| Facine Heating & Cooling 1302 Irving Ave, Royal Oak 48067 | (248) 541-0599 |