• Coil 15 to 20

• Compressor 5 to 15

• Fan 15 to 20

• Clothes Washer / Dryer 6 to 12

• Dishwasher / Garbage Disposal 5 to 12

• Oven / Range / Refrigerator 10 to 20

• Service Entry Cable 20 to 40 (depends on exposure to sunlight)

• Panel Box - Breaker and Fuse 20 to 50 (depends on the amount of moisture in the area of box and contacts)

• Wiring - interior, copper

  • Armored Cable (BX) 75+

  • Cloth Sheath (Standard) 30 to 60

  • Knob and Tube 50 to 75

  • Plastic Sheath (Romex) 75+

• Boiler

  • Cast Iron 30 to 50

  • Steel 30 to 40

• Circulating Pump 10 to 15

• Expansion Tank 5 to 10

• Exposed Duct Work 20+

• Fan 10 to 40 Gas

• Furnace 15 to 25

• Heat Exchanger 15 to 30

• Heat Pump (electric) 20 to 25

• Humidifier 5 to 10

• Oil Furnace 20 to 30

• Oil Tank (inside of home) 25 to 50

• Pipe

  • Copper 60+

  • Steel 70 to 100

• Zone Valves 5 to 10

Interior Service and Drain Lines

• Cast Iron 30 to 50

• Copper 10 to 50

• Galvanized Steel 30 to 50

• Lead 40 to 80

• Plastic (PVC, ABS, PB) unknown

• Asphalt Shingle

  • Regular 15 to 20

  • Multi-thickness 20 to 30

  • Interlocking 15 to 25

• Built-Up (per ply) 2 to 4

• Cement Asbestos 30 to 75

• Clay Tile 20+

• Metal 15 to 40 (tin-recoat every 5 years) 50 to 90

• Roll 10

• Slate (depends on grade) 30 to 100

• Wood Shake/Shingle 10 to 40

• Aluminum 20 to 30

• Asbestos 20 to 75

• Brick / Block / Stone 100+ (may need periodic pointing)

• Hardboard/Composition 5 to 10

• Stucco 70 to 100+

• T1-11 Plywood with regular coating 10 to 20

• Vinyl 30 to 50

• Wood Shake / Shingle 5 to 15

No limit (depends on design, construction and human living conditions)

• Electric 10 to 15

• Gas 8 to 12

• Oil 10 to 20