ctboston
New Member
Hi all,
Have enjoyed learning from these forums for many years, and finally ready to ask a question...
Our new home on Cape Cod Massachusetts (Climate Zone 5) is very well insulated but has architectural feaures that are challenging - some vaulted ceilings and lots of large windows. There is about 2,600 sf of conditioned space.
We installed a Viessmann boiler for DHW and underfloor radiant heat (stapled up plates below subfloor). Per code, there basement ceiling is R-30 with Roxul and Fiberglass.
The house also has a Mitsubishi heat pump setup with one outdoor unit MXZ-SM48NAM-U1 <not hyperheat> coupled with 3) indoor units (wall mount, medium static, and a high static unit similar to a furnace). The cooling was awesome this summer with great dehumidification and virtually silent operation both inside and out.
ISSUE: Electricity is very expensive here - $0.33 per kWh and rising, and natural gas is ~$2.50 per thern. Initial plan was to baseload the radiant, and use the HP to supplement and fine tune comfort. I have struggled to find the cutover temperature, so I just assume 32F. Would love to find a tool that gives strategy incorporating both temperature and energy costs. Any suggestions? The Mitsubishi documentation does not include a COP vs. OAT curve.
IDEALLY - would love to have some sort of integrated controller that manages this cutover. The contractor installed wireless t-stats, and I am contemplating asking him to return and install the Mitsubishi Kumo Cloud platform, which was never in the original scope, although I don't think Kumo is capable of the cost comparison strategy...
THANKS IN ADVANCE!
Have enjoyed learning from these forums for many years, and finally ready to ask a question...
Our new home on Cape Cod Massachusetts (Climate Zone 5) is very well insulated but has architectural feaures that are challenging - some vaulted ceilings and lots of large windows. There is about 2,600 sf of conditioned space.
We installed a Viessmann boiler for DHW and underfloor radiant heat (stapled up plates below subfloor). Per code, there basement ceiling is R-30 with Roxul and Fiberglass.
The house also has a Mitsubishi heat pump setup with one outdoor unit MXZ-SM48NAM-U1 <not hyperheat> coupled with 3) indoor units (wall mount, medium static, and a high static unit similar to a furnace). The cooling was awesome this summer with great dehumidification and virtually silent operation both inside and out.
ISSUE: Electricity is very expensive here - $0.33 per kWh and rising, and natural gas is ~$2.50 per thern. Initial plan was to baseload the radiant, and use the HP to supplement and fine tune comfort. I have struggled to find the cutover temperature, so I just assume 32F. Would love to find a tool that gives strategy incorporating both temperature and energy costs. Any suggestions? The Mitsubishi documentation does not include a COP vs. OAT curve.
IDEALLY - would love to have some sort of integrated controller that manages this cutover. The contractor installed wireless t-stats, and I am contemplating asking him to return and install the Mitsubishi Kumo Cloud platform, which was never in the original scope, although I don't think Kumo is capable of the cost comparison strategy...
THANKS IN ADVANCE!
