Hi there, I appreciate your time with my ignorance. Recently purchased a home with a Waterfurnance 5 Series, installed a few years prior, after the previous owner was not please with their propane bills. Based on the Model Number (NDV072G111CT0BA) It has a dual capacity compressor - What does this mean? Unit Capacity is 072 - What does this mean? It generates how water with factory installed pump. Has a variable speed ECM- What does this mean? Has the Aurora Advanced Control Board (ABC and ABX) - What does this mean - I seem to have a basic thermostat that has an "Instant Energy Monitor" With Intellistart. What is the tonnage capacity? How do I find that out? I know very little about the system except how to wash and change the air filter, obviously. We have a 3200sqft residence and we have been pleased with the comfort/electric bills thus far but have only been in the house about 2 months of mild fall weather. We have a ground loop that is 5-6 feet deep. I desire to know more about the instant energy monitor. Blower 46w every hour to circulate air. When the system kicks on the compressor is up to 36XXwatts and the Elect heat (when producing heat) is usually about 100 watts. Does this seem to make since? I want to make sure my system is set up to run most cost effectively as it seems there are quite a few post regarding improperly setup systems with high electric usage.