How to Choose the Right Heat Pump for an Open-Plan Home

Open-plan homes often combine the living room, kitchen, and dining area into one large space, sometimes with high ceilings, expansive windows, and fewer interior walls.

While this layout can make a home feel larger and brighter, it can also create heating and cooling challenges. For example, a living area with floor-to-ceiling windows may get significantly warmer during the afternoon, while the kitchen and dining areas remain relatively comfortable.

Heat pumps can efficiently heat and cool open-plan homes, but choosing the right system means looking beyond equipment capacity to cover the floor area.

The home's layout, ceiling height, insulation, window placement, and existing ductwork all affect how well a heat pump will maintain comfortable temperatures throughout the space.

In this guide, we'll explain how to choose the right heat pump for an open-plan home and what to consider before installing one.

Do Heat Pumps Work Well in Open-Plan Homes?

Heat pumps can work particularly well in open-plan homes because fewer interior walls can make it easier to distribute heated or cooled air throughout a large living space.

However, an open floor plan doesn't automatically mean that one heat pump or indoor unit will provide even temperatures everywhere.

For example, a ductless heat pump installed in the living room may effectively heat and cool the adjoining dining area, but it could struggle to reach a kitchen around a corner or bedrooms separated by doors.

Similarly, homes with vaulted ceilings, large windows, or multiple floors may have different heating and cooling requirements within the same open living area.

The right solution depends on how the space is designed and whether the heat pump can distribute conditioned air to all the areas that need it.

1. Consider the Size and Layout of Your Open-Plan Space

First, understand your home's heating and cooling needs.

Homeowners often start by looking at the total square footage, but floor area alone doesn't determine the correct heat pump size.

For example, two homes with identical floor plans may have very different heating requirements if one has 9-foot ceilings and the other has a two-story living room with large windows.

Other factors that affect heating and cooling requirements include:

• Ceiling height and room volume

• Number, size, and orientation of windows

• Insulation levels in walls, ceilings, and floors

• Air leakage around windows and doors

• Local outdoor temperatures

• Heat generated by kitchen appliances and other indoor equipment

  
  

A professional HVAC contractor should perform a heating and cooling load calculation, commonly using ACCA Manual J, to determine the capacity required.

This calculation helps prevent installing an undersized system that struggles to maintain temperatures or an oversized system that cycles too frequently and may struggle to control humidity.

It's also important to think about how the space is divided into functional areas. As this guide to designing an open-plan kitchen and living room explains, furniture, lighting, and flooring can create distinct zones without walls.

Also consider these design choices when planning how heated and cooled air will move through the room.

2. Decide Between a Ducted and Ductless Heat Pump

Both ducted and ductless heat pumps can suit open-plan homes. Before scheduling heat pump installation, homeowners should consider their existing ductwork, room layouts, and how they want the heating and cooling equipment to fit into their interior design.

Ducted Heat Pumps

A ducted heat pump uses an indoor air handler and ductwork to distribute conditioned air throughout the home.

If your home already has a properly sized central heating and cooling system with ductwork, installing a ducted heat pump may be a practical option.

Ducted systems can also be appealing in open-plan interiors where homeowners prefer to keep heating and cooling equipment out of sight.

Instead of visible wall-mounted indoor units, the conditioned air enters through supply registers installed in the ceiling, walls, or floors.

However, you must evaluate the existing ductwork before installation. Leaking, poorly insulated, or undersized ducts can reduce efficiency and create uneven temperatures, even when the heat pump itself is correctly sized.

Ductless Heat Pumps

Ductless heat pumps, commonly called mini-splits, deliver heated or cooled air directly into a room through an indoor unit.

They can be particularly useful in open-plan homes without existing ductwork or in properties where installing new ducts would require substantial renovation.

For example, a large, well-insulated living and dining area may suit a strategically positioned ductless unit.

However, you may need additional indoor units if the home has separate bedrooms, multiple floors, or areas that don't get enough airflow.

Ductless systems also come in different indoor configurations, including wall-mounted, floor-mounted, and some ceiling-mounted options.

For homeowners who want to preserve a minimalist interior, choosing the right indoor unit style and position can be just as important as selecting the equipment itself.

3. Consider Whether Your Home Needs Multiple Heating and Cooling Zones

One challenge with open-plan homes is that different parts of the living space may experience different temperatures throughout the day.

For example, a kitchen can warm up when appliances run, while a living area with large west-facing windows may get strong afternoon sun.

In a two-story open-plan home, the upper floor may also get warmer than the lower level, especially in summer.

A single thermostat cannot always account for these differences.

Depending on the home's layout, a zoned heating and cooling system may provide better temperature control.

With a ductless setup, separate indoor units can serve different areas, letting occupants adjust temperatures independently.

Some ducted heat pump systems can also incorporate zoning controls and dampers, provided the equipment and ductwork are designed to accommodate them.

However, not every open-plan home needs multiple zones. A relatively compact, well-insulated living space may maintain consistent temperatures with one appropriately sized system.

The decision should depend on the home's heating and cooling loads, airflow patterns, and whether different areas regularly experience uncomfortable temperature differences.

4. Plan the Indoor Unit Placement Around Your Interior Design

The placement of a heat pump's indoor unit can affect both performance and your home's appearance.

In open-plan interiors, walls often separate different functional areas. A wall that looks ideal for a heat pump may also be where you want to install artwork, shelving, a television, or built-in cabinetry.

For ductless systems, the indoor unit needs enough clearance and a position that lets air circulate throughout the intended space.

For example, installing a wall-mounted unit directly above tall cabinetry may restrict airflow, while placing it in a distant corner may make it harder to distribute conditioned air evenly.

Also consider whether the unit will blow air directly toward a dining table, sofa, or other frequently occupied seating area.

Ducted systems introduce different design considerations because you must incorporate vents and return-air grilles into the room.

As discussed in this article on making your HVAC system work with your interior design, you can integrate heating and cooling equipment into a home's overall aesthetic rather than treating it as an afterthought.

However, decorative screens, cabinets, and other design features should never obstruct the equipment's required airflow or service access.

5. Account for High Ceilings and Large Windows

Open-plan homes often feature architectural elements such as vaulted ceilings, skylights, and large glass doors that connect indoor and outdoor living areas.

These features can influence how much heating and cooling the home requires.

High Ceilings

High ceilings increase a room's air volume and can affect temperature distribution.

During winter, warm air may collect near the ceiling, leaving the occupied area below feeling cooler than expected.

A properly designed heating system should account for this temperature difference and distribute warm air effectively throughout the living space.

Ceiling fans can also help circulate air, especially when run at a low speed during winter.

However, coordinate the placement of ceiling fans, light fixtures, and air outlets during the design process.

This is especially important in homes with vaulted or cathedral ceilings, where space for ductwork may be limited.

The article on how ceiling design affects ducted air conditioning explains how ceiling height, bulkheads, and roof cavities can influence HVAC installation.

Large Windows

Large windows can also create substantial differences in heating and cooling requirements.

For example, a west-facing living room with expansive glass may get significant afternoon sun in summer, while poorly insulated windows can increase heat loss in winter.

Before selecting a heat pump, consider your windows' orientation and energy performance.

Appropriate window treatments, exterior shading, and energy-efficient glazing can help reduce heating and cooling demands.

These improvements may also affect the equipment capacity your home needs, so consider them before the final heat pump sizing calculation.

6. Check Your Home's Insulation and Existing Ductwork

Even a properly sized heat pump may struggle to maintain comfortable indoor temperatures if the home has inadequate insulation or significant air leakage.

For example, an open-plan living room with poorly insulated ceilings may lose heat quickly during winter. Similarly, gaps around large sliding doors can let conditioned air escape and outdoor air enter.

Before investing in a new heat pump, consider whether the home needs improvements to its insulation, air sealing, or windows.

If you're replacing an existing central heating and cooling system, also inspect the ductwork for leaks, restrictions, and adequate airflow.

According to the U.S. Department of Energy's Building America guidance, correctly sizing and positioning ductless indoor units is important for efficient operation and proper temperature control.

The same principle applies to ducted systems, where equipment capacity and ductwork design must work together.

It's generally better to identify these problems before installation than to discover afterward that your new heat pump cannot maintain consistent temperatures.

7. Compare Heat Pump Efficiency and Performance

Once you've determined the appropriate system configuration and capacity, compare the efficiency and operating characteristics of the available heat pumps.

For air-source heat pumps, two important efficiency ratings are SEER2 and HSPF2.

SEER2 measures seasonal cooling efficiency, while HSPF2 measures seasonal heating efficiency. Higher ratings generally indicate more efficient operation under the applicable test conditions.

However, efficiency ratings aren't the only consideration.

You should also evaluate how well the equipment performs at your area's typical outdoor temperatures.

For example, homes in colder climates may benefit from heat pumps specifically designed to maintain heating capacity at low outdoor temperatures.

Variable-speed heat pumps can also help in open-plan homes because they adjust output as heating and cooling demands change.

Rather than operating only at full capacity, many variable-speed systems can run at lower speeds for extended periods, helping maintain more consistent indoor temperatures.

Your contractor should compare equipment performance against your home's calculated heating and cooling requirements rather than recommending a system based only on its advertised efficiency rating.

8. Plan the Installation Before Finalizing Your Renovation

If you're planning to install a heat pump while renovating an open-plan home, coordinate the HVAC work with the rest of your interior design plans.

The heat pump you choose can affect wall layouts, ceiling construction, electrical requirements, equipment locations, and furniture placement.

For example, installing a ductless system may require routing refrigerant lines and electrical connections through walls or ceilings.

A ducted system may need additional space for ductwork, supply registers, and return-air pathways.

Outdoor unit placement must also account for manufacturer-required clearances, maintenance access, noise, and the appearance of the home's exterior.

Before work begins, ask your contractor to explain how the proposed system will distribute air throughout the open-plan space and whether any changes to the existing ductwork, electrical system, or insulation are necessary.

It's also useful to involve your interior designer or renovation contractor before finalizing equipment locations.

Final Thoughts

Heat pumps can provide efficient, comfortable heating and cooling for open-plan homes, but the right system depends on more than the living area size.

Ceiling height, window placement, insulation, airflow, and indoor unit placement all affect how effectively a heat pump heats and cools the space.

A ducted system may suit homes with existing ductwork or homeowners who prefer concealed equipment, while ductless systems offer flexible installation options for properties without ducts.

Before choosing equipment, have your home's heating and cooling requirements calculated and discuss how the system will distribute air throughout the living, dining, and kitchen areas.

By planning the heat pump around your interior layout, you can keep your home open and uncluttered without sacrificing everyday comfort.