Purposely undersizing the heat pump doesn't make much sense to me. Geothermal systems are most efficient when they are allowed to maintain a constant temperature. Programing a thermostat to cycle temps up and down around home activity actually will increase your electric bill. If the geothermal is sized right then the heat strips should rarely if ever activate.
Undersizing HVAC doesn't make long term sense for the consumer, but is common enough as some contractors (IME, YMMV) propose a system smaller than what should be used in order to submit a low bid.
Theoretically, an upgrade to the transformer only succeeded in treating the symptoms. It didn't fix the root cause being simultaneous heat source demand caused by an undersized heat pump. The electric co. just made it easier to draw more power.
I agree, but then that IS their business. All they can fix is their electric supply - not correct any sizing problems with the geothermal HVAC.
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