| 47 × | water heater venting | 10 × | ac lines insulation | 7 × | natural draft water heater venting | ||
| 21 × | sump pump | 10 × | plumbing vent | 7 × | furance venting | ||
| 20 × | water heater vent | 10 × | attic vents | 7 × | chimney | ||
| 17 × | water heater power vent | 10 × | plumbing vent problems | 6 × | bathroom exhaust | ||
| 17 × | attic ventilation | 10 × | furnace venting | 6 × | soot stains | ||
| 12 × | chimney liner | 9 × | power vent water heater | 6 × | stains on walls | ||
| 12 × | plumbing | 8 × | bathroom exhaust fan | 6 × | cathedral ceiling ventilation | ||
| 11 × | ac refrigerant lines | 8 × | attic insulation | 5 × | garage door safety sensors | ||
| 11 × | attic mold | 7 × | garage firewall | 5 × | garage safety sensors | ||
| 10 × | chimney flue | 7 × | refrigerant lines insulation | 5 × | garage door opener |