100 amp service large enough for a heat pump?

[Stevenfyeager]

For a 1200 sq ft new house, I would always install a 200 amp service if they are using a heat pump for heating. But when I do calculations for existing small houses like this, it seems that 100 amps is borderline, but might work. Asuming all electric. What do you do?
Thank you

 

[Ponchik]

If it is border line then install a 200Amp.

 

[ptonsparky]

For existing homes not likely to see an addition, 125 works. Often you can use the same conduit with a change of the meter socket.

 

[Dennis Alwon]

The heat pump is not the issue so much as the heat strips. Without other info it is impossible to know whether a 100 amp service will work. There is also a 125 amp service that may suit your fancy