The short answer is that tipping tradesmen such as appliance technicians is unnecessary and if you choose to tip, your tip should reflect the quality of service you received.

Should you tip exterminators?

Mayne says exterminators generally don't expect tips. "But if the person does something extra, such as treat an area more heavily than normal or move furniture, you may want to tip $5 to $10. Holiday tipping of $20 or a restaurant gift card is always appreciated," Mayne says.

What services should you tip for?