Heat Pumps

Heat pumps transfer heat rather than generating it by burning fuel. In suitable commercial and industrial applications, they can provide heating and cooling while reducing the use of on-site fossil fuels. The right choice depends on the building, required temperatures, available electrical capacity and operating costs.

How heat pumps work

A refrigerant circuit moves heat between a source and the building. In heating mode, an air-source system extracts heat from outdoor air; in cooling mode, it rejects heat outdoors. Performance depends on the equipment and the temperatures on both sides of the system.

Cold-weather capacity matters

Cold-climate models can operate below freezing, but their heating capacity and efficiency vary with outdoor temperature. Selection should use manufacturer performance data at the project’s design conditions, including defrost operation and any supplementary heating requirements. A system that meets a mild-weather load may not cover the peak winter demand.

What to assess before a commercial retrofit

• Heating and cooling loads, operating hours and the temperatures required by the distribution system.
• Electrical service capacity, equipment location, noise, access and maintenance clearances.
• Compatibility with existing ductwork, hydronic distribution and controls.
• Energy tariffs, demand charges, supplementary heat and the basis for comparing lifecycle costs.

High equipment efficiency does not automatically mean lower utility bills or a particular carbon reduction. Compare the proposed system with the actual alternative using local energy prices, electrical supply conditions and building loads.

Plan the equipment and controls together

Arvin Air’s HVAC engineering and design-build team can review site constraints, while DDC controls help coordinate equipment operation. Explore our commercial HVAC installation and retrofit services.

For an explanation of the underlying technology, see the U.S. Department of Energy’s air-source heat pump guide. Its residential examples are not forecasts for a commercial project.

Three checks before specifying heat pumps

1. Establish the load and required water or air temperatures

Start with how the building is used, not the capacity printed on the existing equipment. Review occupancy, operating schedules, ventilation requirements and any process loads. Where available, compare drawings with service records and actual operation. Changes to insulation, production or space use may mean the original design assumptions no longer apply.

For hydronic systems, the temperature required by existing emitters is especially important. Ask how the proposed heat pumps will perform at that temperature during cold weather. For air systems, review airflow and distribution alongside equipment capacity. Record assumptions so competing proposals can be compared on the same basis.

2. Define supplementary heating and electrical requirements

A proposal should explain what happens when outdoor conditions fall below the selected operating point. Establish which equipment will supply any remaining load and how controls will coordinate it. Discuss the consequences of a power interruption or equipment fault where continuity is important.

Check the available electrical supply and installation requirements before assuming a replacement will fit within the existing infrastructure. Include service upgrades, distribution modifications, equipment access and commissioning in the cost comparison where applicable. These are project questions, not a claim that every installation requires the same work.

3. Plan the handover and performance review

Ask what operating sequences, trend records and maintenance instructions the facility team will receive. A successful handover explains normal operation, alarms, seasonal changes and who is responsible for reviewing performance. Retain the equipment selections and their stated design conditions for future reference.

Review the system after it has operated through representative conditions. If energy use differs from expectations, investigate the load, schedules, controls and supplementary heat before attributing the difference to one component. A meaningful comparison accounts for weather and changes in use rather than relying on a single utility bill.