Location?

What size heat strip do you have now? 13 KW is a little light for a 4 ton especially during a defrost cycle to temper the air.

Looks like AHRI matching number #3540158.
Excellent performance/efficiency numbers across the board.

Has demand defrost which is great!

IMO

Pacific coast. Fairly mild climate, temps running averaging between 37-76 through the year. Some years it does snow (occasionally over a foot). Temps have gotten to 0, but actually rarely get as low 10, and at the other end not very often are they over 90.

I wondered the same thing on the heat strips. I believe that I was told the power available for old strips was 20kw.

Is the thermostat one you are familiar with?

Thanks!

I would want a 15 KW at the minimum staged in 5 KW increments or perhaps 2 7.5 KW strips. Discuss with dealer.

Thermostat mdl number looks like a HW VP IAQ model which is one of the best. Verify with dealer.

IMO

Thank you very much for your help.