American Standard Freedom 95 Comfort-R variable speed

Up to 96.7 AFUE
Comfort R
Variable Speed
Two Stage Heating

American Standard Freedom 90 Comfort-R variable speed

Up to 93 AFUE
Comfort R
Variable Speed
Two Stage Heating
AccuClean

Freedom 90 Two Stage

Trane XV-90

Same as the American Standard Freedom 90 Comfort-R

American Standard Allegiance 18: 18.90 SEER
Carrier Infinity ($5000 for 3 ton) 2-stage Puron. In reviews, experts say the 18 SEER (higher SEER numbers are more efficient) Carrier is the most advanced high-efficiency central-air unit. It uses the more environmentally friendly refrigerant Puron, not Freon. The Infinity has two speeds, which results in less cycling on and off. Reviews say the Carrier is the only system in the industry that allows you to also control humidity, air quality, fan speed, and ventilation. The Carrier even announces when the filter needs changing. Carrier includes a ten-year warranty on the compressor and five years on other parts. If you don't need such a high-end system, some Bryant and Rheem models are a bit less efficient, but are significantly less expensive. Boiler Current boiler: Burnham Series 2A 1991 80% AFUE? W-21 D-25 H-31 Burnham

Boiler