The most instructive project in this collection might be the least glamorous: a 2002 walkout-basement house in West Michigan, retrofitted step by step by GreenHome Institute education manager Brett Little. No custom architect, no new construction — just an ordinary house on an ordinary street, taken to net-zero carbon.
The playbook: a cold-climate heat pump for heating and cooling, a heat pump water heater, comprehensive ventilation and air-quality monitoring, and a solar array grown to 9.72 kW with 5 kW of battery storage. The financing is the real lesson — a plain mortgage refinance covered the upgrades, adding about $40 a month to the payment while cutting roughly $50 a month in utilities. The retrofit paid for itself from day one, and the home's value rose about 3%.
The house holds a perfect 10/10 DOE Home Energy Score and Pearl Platinum certification, carries the Electrified Living badge, and is pursuing GreenStar's Zero Carbon recognition.
At a glance
- Net-zero carbon retrofit of a 2002 home — heat pump HVAC, heat pump water heater
- 9.72 kW solar with 5 kW battery storage, grown incrementally
- Financed by refinancing: ~$50/month utility savings against ~$40/month payment increase
Owner-led retrofit by Brett Little, GreenHome Institute
Your project could be next.
This project followed the same published checklist available to everyone. See where your home stands, or register with the GreenHome Institute.