Project Design

The data collected in the audit is assembled, along with detailed fuel and utility records, and entered into the ZEN Design Tools. These combine energy modeling, and efficiency and cost analysis to determine optimal strategies to get your home off of fossil fuel.

Actual fuel and electricity use helps to qualify the modeling of the home’s envelope, and the efficiency of its energy systems. These in turn qualify predictions of future energy use and cost savings, and provide a basis for designing an optimal and cost-effective transition away from fossil fuels.


A well designed project is what makes the house perform effectively as a system – minimizing energy use, reducing costs, and keeping you most comfortable in winter cold and summer heat.