Renovation and Phased Deep Energy Retrofit > RR|A believes strongly in working with existing buildings to improve their energy performance. A deep energy retrofit is the renovation of an existing home that results in the profound reduction of energy consumption. This whole-building approach addresses many different systems at once, thereby achieving greater energy efficiency than a conventional energy retrofit. All new additions have super insulated walls. In addition, new high performance windows were installed throughout, and the entire roof was upgraded. A new heat recovery ventilator provides precise amounts of fresh air. As additional funds are available, future phases will upgrade walls and the heating system.