Old Meets New

Hanover, NH

General Contractor: Alger Brook Design Build

Mechanical Contractor: ARC Mechanical

Project Description:

This deep energy retrofit to an existing historic single-family home and all-new addition are served by three air source heat pump systems and two energy recovery ventilators, one for each side of the building. The historic side of the building is served by ducted heat pumps using floor registers on the first floor and ceiling diffusers and returns on the second floor. The addition is served by a horizontal ducted fan coil on the first floor and ductless wall heads on the basement and second floors. A heat pump water heater with recirculation provides domestic hot water to the whole building.

The north elevation features gardens, outdoor space, and concealed heat pump outdoor units.
The south elevation of the building facing the main street does not have any mechanical equipment or louvers.
The east facade of the original building has hoods near grade that are for ERV intake and exhaust, and kitchen exhaust.
Mitsubishi cold climate heat pumps serving the historic side of the building are conceled from the street usign bushes and from the back porch and driveway using a lattice structure.
The heat pump outdoor unit for the addition is concealed behind bushes.
The living room in the original side of the building has floor registers and a central return grille for the basement air handler.
The original side of the building uses Fittes floor registers with matching flooring inserts, creating a clean, sophisticated look.
The first floor and basement of the original historic side of the building are served by a multiposition ducted air handler located in the basement.
The kitchen is heated and cooled by a pair of supply grilles on the back wall. Continuous exhaust is provided to the kitchen by the ERV. A ceiling filtered exhaust grille with a remote fan provides supplemental exhaust when needed.
Dual 6x6 supply registers serve a difficult to get to kitchen area with fully adjustable air distribution.
Typical bedrooms in the original side of the home use central 4-way air diffusers and allow air to transfer out of the bedrooms to the hall where the filter return is located, using transfer ducts.
The air handler that serves the second floor of the original building is installed in a tight space that is not easy to get to. To make routine air filter changes easier, a filter return is provided in the hallway that can be reached from a step stool so that nobody needs to crawl into an attic hatch.
This supply grille is responsible for heating and cooling the back mudroom area.
RenewAire EV Premium L serving the original side of the building.
Bathrooms are provided with constant exhaust from central ERV systems. A small boost button to the left of the light switch temporariily increases airflow when needed.
This small attic in the connector between the addition and the original building is home to a Renewaire EV Premium ERV and a horizontal ducted heat pump fan coil unit that serves the addition living room and connector. These ERVs can be installed in any orientation, including on a sloped ceiling.
The addition living room has one supply grille on the back wall above the doors that serves the entire room. We were able to get away with this simple distribution because the building enclosure is so good. Fresh air is provided by a separate round ceiling diffuser in the center of the room.
The addition second floor bedroom receives 100% fresh air from a central round ceiling diffuser next to the light.
This heat pump wall head serves the second floor of the new addition.
A heat pump water heater with mixing valve and recirculation pump provides hot water to the entire home.

Old Meets New

Hanover, NH

The north elevation features gardens, outdoor space, and concealed heat pump outdoor units.

The south elevation of the building facing the main street does not have any mechanical equipment or louvers.

The east facade of the original building has hoods near grade that are for ERV intake and exhaust, and kitchen exhaust.

Mitsubishi cold climate heat pumps serving the historic side of the building are conceled from the street usign bushes and from the back porch and driveway using a lattice structure.

The heat pump outdoor unit for the addition is concealed behind bushes.

The living room in the original side of the building has floor registers and a central return grille for the basement air handler.

The original side of the building uses Fittes floor registers with matching flooring inserts, creating a clean, sophisticated look.

The first floor and basement of the original historic side of the building are served by a multiposition ducted air handler located in the basement.

The kitchen is heated and cooled by a pair of supply grilles on the back wall. Continuous exhaust is provided to the kitchen by the ERV. A ceiling filtered exhaust grille with a remote fan provides supplemental exhaust when needed.

Dual 6x6 supply registers serve a difficult to get to kitchen area with fully adjustable air distribution.

Typical bedrooms in the original side of the home use central 4-way air diffusers and allow air to transfer out of the bedrooms to the hall where the filter return is located, using transfer ducts.

This supply grille is responsible for heating and cooling the back mudroom area.

RenewAire EV Premium L serving the original side of the building.

Bathrooms are provided with constant exhaust from central ERV systems. A small boost button to the left of the light switch temporariily increases airflow when needed.

This small attic in the connector between the addition and the original building is home to a Renewaire EV Premium ERV and a horizontal ducted heat pump fan coil unit that serves the addition living room and connector. These ERVs can be installed in any orientation, including on a sloped ceiling.

The addition living room has one supply grille on the back wall above the doors that serves the entire room. We were able to get away with this simple distribution because the building enclosure is so good. Fresh air is provided by a separate round ceiling diffuser in the center of the room.

The addition second floor bedroom receives 100% fresh air from a central round ceiling diffuser next to the light.

This heat pump wall head serves the second floor of the new addition.

A heat pump water heater with mixing valve and recirculation pump provides hot water to the entire home.

Lacey Engineering, PLLC