HVAC System at the Captain Morse House

The Captain Morse House has three different HVAC systems divided into 4 separate zones.
Front living room, back dining room area, 2nd floor middle bedroom and the 3rd floor attic.


  • Do not set one Thermostat to HEAT and another to COOL – They should all be in the same state
  • Make sure ALL windows and doors are closed when running the system
  • Turn all 4 thermostats to OFF if you open the windows and doors 
  • Do not use LOCK
  • Never set the Fan to ON – only use Auto
This home was built in 1840 and has no insulation in it except for the attic where we installed foam insulation in 2016. This insulation is still not up to modern standards of thickness but it did help out a bit.
Because of this you will need to adopt some “old-time” solutions to keeping the house cool during heatwaves. 
  • Lower the window shades on the sunny side / Morse Street side of the house. This will be the most effective way of keeping the house cool during the day.
  • Keep all windows and storm windows down during heat waves to improve the insulation at the windows.
  • If it is cooler outside than inside consider turning off all 4 thermostats and opening up the doors of the house for great cross ventilation. It’s what people did for 160 years before AC when the vineyard was known for its cooling breezes.
  • Use all four thermostats in the COOL position with fan set to AUTO. Do not turn one of them off, especially on the 3rd floor, unless that floor is unoccupied.
  • Use the provided box fans to provide additional cooling. It is amazing what moving air can do for cooling.
  • Sleep under sheets rather than under comforters like it is snowing outside and you are in some swiss chalet.
  • The East wing of the 3rd floor has the least amount of windows. The front 3rd floor window is all there is. The roof scuttle cannot be trusted to stay open because the wind can blow it shut and break it.

Here is an explanation of how the BAYWEB thermostats run. If you see LO on the thermostat it means it is locked and cannot be adjusted by the user. Let us know if you are not comfortable and we will adjust the automatic settings until you are. Never set the Fan to ON – only use Auto

There are four thermostats in the house. 2 each on each wing of the 1st floor,One in Bedroom 4 of the East Wing and 1 in the West Wing of the 3rd floor.
For 2020 we began to rent the house as East and West wings. The 1st floor is fine but the HVAC on the 2nd and 3rd floors is shared. To work around this we have set the energy saving occupancy settings off so that the wings will have constant cooling regardless of which wing has occupants.

If you activate the thermostat (Press COOL or HEAT to start) make sure ALL windows and doors are closed and all other thermostats are either off in the same state, either all COOL or all HEAT.
You may not need the HVAC system at all during your visit. The system wasn’t needed at all in the previous 170 years of the house.
If you wish to open the windows and doors for the natural island cooling breezes please TURN OFF all thermostats.

Please close windows and doors if rain approaches.

Automatic Cooling Settings
When you are away the setting for cooling is 77 degrees
When you return it will automatically sense that and lower to 73 degrees
For sleeping, it is set to 71 degrees for the duration of the night.
The attic is NOT well insulated and will not cool except for sleeping at night.
For sleeping at night it will lower to 74.

Automatic Heating Settings
When you are away the setting for heat is 63 degrees
When you return it will automatically rise to 67 degrees
For sleeping, it is set to 64 degrees

Humidity is controlled via the first-floor front and 2nd-floor thermostats
The system will automatically run if indoor humidity is above 50% but will turn off in the room temp falls more than 2 degrees below the current automatic set point to prevent compressor damage.
For comfort, optimal indoor humidity levels should be between 35 and 55 percent.



This is mostly for maintenance and HVAC technician use.
Techs should print this and take to the house.
System #1 is located in the front basement and is accessed by a green scuttle next to the trash containers. Also in this space is a whole-house humidifier that keeps the crawl spaces dehumidified. This system services the front living room, media room, dining room, and kitchen. The thermostat is located in the front living room and senses temperature as well as humidity. There is an associated motion detector that activates the system when occupancy is detected located in the dining room.
System #2 is located in the back basement and is accessed through the west exterior basement door with the round porthole opposite the garden. The thermostat is located on the east wall of the living dining area in the back of the house. There is an associated motion detector which activates the system when occupancy is detected located at the base of the stairs.
System #3 is in the attic and serves the 2nd and 3rd floors. It is the largest system. It is located behind a small door opposite bedroom #7 on the third floor. Bedroom #7 is the one closest to the 3rd-floor bathroom #7. This system has two thermostats. One is in the hallway just west of the small door. The other is located on the West wall of the Middle Bedroom #4. There are associated motion detectors that activate the system when occupancy is detected located outside the master bedroom #1 and in the hallway on the 3rd floor.

Programming access is done through this website

password is _____________________

Thermostat manual is here
Bay Web Thermostat Manual