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This guide focuses on U.S. commercial projects and operational energy goals. The owner and design team must first agree on what “net zero” counts: for example, whether the target is based on annual site energy, source energy, or a particular program’s definition, and which building loads and renewable generation are included. A net-zero energy target does not, by itself, establish that a building has net-zero carbon emissions.
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Why the building’s loads come before equipment selection
Heating and cooling equipment is sized to serve a building’s loads. Those loads are shaped not only by weather and floor area, but also by the envelope, windows and shading, lighting, plug and process equipment, kitchens, occupancy, ventilation needs, and schedules. These decisions affect both how much energy the building needs over a year and the peak heating and cooling capacity the HVAC system must provide.
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Settle the project boundary and operating profile early. The owner should identify the target definition, included loads, intended schedules, anticipated occupancy, and any special requirements such as kitchen or process loads. The design team can then coordinate the envelope, lighting, equipment, and HVAC strategy around a consistent set of assumptions.
How to choose: a project-specific sequence
1. Define the energy target and project boundary
Document what the project means by net zero before comparing equipment. Confirm whether the goal is annual site energy, source energy, or a specific owner or program definition. Identify which loads are included and how renewable generation is counted. The HVAC guidance discussed here provides design principles, not a project-specific accounting method, so the owner and applicable program must settle the boundary for the particular project.
This definition matters because a system that performs well against one accounting boundary may not produce the same result against another. Keep the target and its assumptions visible in the project brief and in energy-model comparisons.
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2. Reduce loads and describe real building use
Coordinate decisions about insulation and other envelope measures, fenestration and shading, lighting, kitchens, plug and process equipment, occupancy, schedules, and ventilation requirements. Document where operating hours or loads are uncertain instead of quietly treating a guess as a settled fact. The owner is often best placed to explain planned uses, staffing, operating hours, and equipment needs; designers need that information to make useful load and system comparisons.
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Consider both annual energy use and design peaks. Annual use affects the renewable energy required for an operational zero-energy target. Peak heating and cooling loads affect equipment capacity and how the system must deliver heating or cooling during demanding conditions.
3. Model loads and size to calculated needs
Use a building energy model that reflects the project’s geometry, location, schedules, and intended uses. DOE identifies OpenStudio, which uses EnergyPlus, as an open-source platform for modeling buildings, applying efficiency measures, and comparing alternatives. A model is useful for evaluating design choices; it is not a substitute for professional load calculations, equipment selection, ventilation design, or code compliance.
DOE recommends sizing HVAC equipment for actual building load requirements rather than relying on floor area alone. As performance benchmarks, its zero-energy building HVAC guidance identifies cooling tons per square foot, heating Btu per square foot, and fan and pump watts per square foot. These indicators can help a team review a design, but they are not universal pass/fail thresholds or substitutes for project-specific calculations. A licensed design professional should determine the loads, capacities, ventilation requirements, and applicable compliance approach.
4. Shortlist system architectures
Compare complete system arrangements, not just equipment names. A heat pump, boiler, or chiller is only one part of a design that also depends on distribution, ventilation, controls, and the timing of heating and cooling demand. The following options appear in DOE’s 2024 guidance on space-heating electrification for large commercial buildings with boilers. Their inclusion does not mean any one is automatically efficient, net zero, or suitable for a particular project.
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| Architecture | What it does | Questions for the project team |
|---|---|---|
| Air-to-water heat pump (A2W) | Produces hot water for a hydronic distribution system. | Can existing hot-water loops or emitters be adapted? What water temperatures does the building require, and do the proposed system and distribution match? |
| Heat-recovery chiller | Can provide cooling while recovering heat for space heating when loads and timing support simultaneous use. | Do heating and cooling needs coincide often enough, and in the right places, to make heat recovery useful? How will the plant handle periods when loads do not coincide? |
| Variable refrigerant flow (VRF) | Distributes refrigerant to zonal conditioning units for heating and/or cooling. | Does the zoning fit the building’s use? How will the refrigerant system be configured, and can the project team operate and maintain it? |
| Ground-source heat pump | Uses a ground loop as its heat source and sink. | Can the site support the ground loop? DOE’s guide describes potential efficiency advantages over air-source systems, but site suitability and project design still need to be assessed. |
| Electric boiler | Uses electric resistance heating with a hot-water distribution architecture. | What electrical demand and project economics result, and how do those compare with heat-pump options for the project? |
| Packaged terminal heat pump (PTHP) | Provides room-level heating and cooling without central distribution and is installed through an exterior wall. | Does the building form suit room-level operation? How will wall penetrations, the envelope, and individual room needs be addressed? |
| Cascade or hybrid arrangement | Combines multiple heat-pump technologies to serve project loads. | How will the systems coordinate, and who will design, commission, and maintain the controls and interfaces? |
Architecture and distribution need to be considered together. An existing hydronic loop may make a hot-water-based approach worth evaluating, but its required water temperatures and condition matter. A building with room-by-room needs may warrant comparison of zonal approaches. A heat-recovery chiller only has an opportunity to recover useful heat when cooling and heating needs line up in time and location. A site proposed for ground-source equipment must be assessed for its loop requirements.
DOE’s 2024 guide reports that 90% of commercial boiler space-heating energy was attributed to natural gas. That figure applies specifically to commercial boiler space-heating energy; it is not a share of all commercial building energy use. The guide describes retrofit options and feasibility factors, not a universal ranking of systems.
5. Compare alternatives on the same decision axes
Use a common comparison matrix so that a familiar equipment label or a single first-cost figure does not decide the project by default. The questions below are prompts for the owner and design team; answers must come from project information, calculations, and current local requirements.
| Decision axis | What to establish |
|---|---|
| Climate and design temperatures | What outdoor conditions must the system serve, and how do they affect capacity and operation? |
| Peak and annual loads | What are the modeled heating and cooling peaks, and the annual energy demands? |
| Heating/cooling coincidence | When and where do heating and cooling occur together, if at all? |
| Distribution and water temperature | What distribution exists or is planned, what temperatures does it need, and can it work with the proposed plant? |
| Ventilation and indoor air quality | How will outdoor air be supplied and controlled independently of the main heating and cooling architecture? |
| Electrical service | Can the existing or planned service support the system, and are upgrades required? |
| Plant and equipment space | Is there sufficient space for equipment and any required site infrastructure? |
| Refrigerant and system configuration | What system arrangement and refrigerant design are proposed, and what does the project need to manage? |
| Controls and operator capability | Can controls support intended operation, and do operators have the skills and support to manage the system? |
| Costs and utility rates | What are the project’s first cost, expected operating costs, applicable utility rates, and maintenance needs? |
| Incentives and local requirements | What current jurisdictional rules, utility programs, and incentives apply to this specific project? |
| Life-cycle cost | How do costs and expected performance compare over the period and assumptions agreed for the project? |
For retrofits, DOE’s 2024 large-commercial-building boiler electrification guidance highlights first cost, operating cost, available space, required water temperatures, peak heat demand, and split incentives as feasibility challenges. Split incentives can complicate a decision when the party paying for an upgrade is not the party that benefits from lower operating costs. Owners should make the relevant costs, responsibilities, and decision rights explicit rather than assuming one stakeholder’s economics represent the whole building.
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Compare alternatives using consistent assumptions for schedules, weather, energy accounting, utility rates, and analysis period. A modeled result is only as useful as its inputs; changes in building use, utility costs, or local program eligibility may change the outcome. Do not infer that a heat pump always has the lowest life-cycle cost or that any single architecture guarantees a net-zero result.
6. Design ventilation, controls, and operation as part of the system
Ventilation is not an afterthought to the equipment choice. DOE’s zero-energy building HVAC guidance recommends a dedicated outdoor air system (DOAS) regardless of the main HVAC type to support efficiency, comfort, and indoor air quality. The project’s design team must determine the ventilation requirements and how the DOAS will coordinate with the selected heating and cooling system.
DOE also recommends keeping air-handling equipment and terminal units within the thermal envelope where practicable. During design, consider how equipment location, controls, and service access will support operation. Controls should be appropriately selected and calibrated; features such as economizers and modulating equipment depend on suitable controls to function as intended.
FEMP’s June 2024 purchasing guidance emphasizes climate, controls, and quality installation. It notes that outdoor conditions affect air-source heat-pump performance and recommends certified cold-climate light-commercial models for cold-climate sites. This is a reason to verify the relevant certification and equipment availability for the project’s market and decision date, not to assume that a model’s label alone settles the design. FEMP also cautions that installation defects can reduce efficiency, cause discomfort, and shorten equipment life.
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Plan for commissioning and post-occupancy performance tracking as part of delivery and operations. The team should establish who verifies system setup, control sequences, and performance after installation, and how actual energy use and comfort will be reviewed against the design assumptions. DOE’s December 6, 2024, Grid-Interactive Efficient Building Strategies and Technologies Guidance Workbook provides retrofit-oriented strategy and control prioritization for owners and facility managers.
7. Verify current local rules, incentives, and procurement conditions
Codes, emissions rules, utility rates, rebates, incentives, and equipment availability vary by location and can change. DOE’s 2024 retrofit guide describes incentives and other factors as motivations for electrification; it does not establish whether a particular project is eligible for a particular program. Confirm current requirements with the jurisdiction and utility and with qualified project advisers before relying on compliance assumptions, rebate amounts, or projected savings.
ASHRAE’s publication description for Decarbonizing Building Thermal Systems: A Guide for Applying Heat Pumps and Beyond identifies heat-pump application and sizing across climate zones, system configuration and refrigerants, electrical requirements, controls, and operation for space and hot-water applications as subjects for design engineers. That scope is a useful indication of how many disciplines a serious system comparison can involve; it is not a substitute for project-specific design.
What a useful selection brief should contain
Before asking the design team to recommend a system, assemble a short project brief with the information that most affects a fair comparison. This helps keep alternatives grounded in the same operating assumptions.
- The project’s agreed operational energy target, accounting boundary, included loads, and renewable-energy assumptions.
- Location, building geometry, intended use, occupancy, schedules, and any special process or kitchen loads.
- Envelope, fenestration, shading, and lighting decisions that affect loads.
- Modeled annual and peak heating and cooling needs, with assumptions clearly identified.
- Existing distribution, required water temperatures, available equipment and plant space, and the condition of existing systems for a retrofit.
- Electrical-service capacity and any likely upgrade requirements.
- Ventilation and indoor-air-quality requirements, proposed DOAS approach, and control strategy.
- Operator experience, maintenance responsibilities, commissioning expectations, and post-occupancy tracking plans.
- First-cost and operating-cost assumptions, utility rates, applicable local rules, and incentives verified for the project.
DOE’s guidance provides a framework for reducing loads, right-sizing, and evaluating system options, but it does not select equipment for a specific building. The project’s professional design team must turn the brief into load calculations, compliant design documents, and a system recommendation that can be built and operated as intended.
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