When changing my HVAC system from Baseboard HW to HW Fan Coil, I am seeing ~50% reduction in annual gas usage. The savings seems to be overly high. Has anyone else had any luck comparing the two? What results did you see?
You didn't mention in the post, but if the motivation for the study was to compare an existing baseboard system controlled by an outdoor reset schedule to an HVAC system controlled by thermostats, then the savings could be dramatic.
50% sounds like a lot - maybe verify that you have a reasonable reset schedule in your base case, and also that the modeled existing base case has reasonable summer heating usage. The actual baseboard system may be deactivated over the summer, if the modeled baseboards are available throughout the year the savings between the two cases could be exaggerated.
You didn't mention in the post, but if the motivation for the study was to compare an existing baseboard system controlled by an outdoor reset schedule to an HVAC system controlled by thermostats, then the savings could be dramatic.
50% sounds like a lot - maybe verify that you have a reasonable reset schedule in your base case, and also that the modeled existing base case has reasonable summer heating usage. The actual baseboard system may be deactivated over the summer, if the modeled baseboards are available throughout the year the savings between the two cases could be exaggerated.
David