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Energy-efficient heating and ventilation in a new rental building depend on coordinated systems, not a single high-efficiency appliance. Heat pumps can provide heating and cooling; mechanical ventilation supplies outdoor air and exhausts indoor air; and heat- or energy-recovery equipment can reduce the energy needed to condition incoming air. The exact arrangement depends on climate, building design, local requirements, and the project’s certification path.
What makes a rental building’s heating and ventilation energy-efficient?
An efficient building delivers the heating, cooling, and outdoor air its occupants need while avoiding unnecessary energy use. That result depends on the whole building: insulation and windows affect how quickly heat moves through the envelope; ducts and equipment affect how efficiently conditioned air reaches apartments; ventilation determines how much outdoor air must be conditioned; and controls influence how the equipment responds to demand.
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Heating and cooling and ventilation are related, but they are not the same job. A heating and cooling system maintains indoor temperature. A whole-dwelling mechanical ventilation system brings outdoor air into homes and exhausts indoor air. They may be separate systems, or a design may integrate some of their functions. Either way, the system must deliver the required ventilation flow while meeting the building’s heating and cooling loads.
There is no one layout used in every new rental. Some projects use equipment inside each apartment; others use central equipment serving multiple homes. Climate, apartment layout, building size, and the design’s performance goals all affect the choice. U.S. Department of Energy (DOE) and U.S. Environmental Protection Agency (EPA) programs provide useful U.S. examples, but their specifications are not universal building-code requirements. Codes and certification rules vary by location.
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How do heat pumps heat and cool apartments?
A heat pump moves heat to provide heating or cooling. Because one system can serve both functions, a heat pump can be part of a building design that avoids using entirely separate equipment for heating and cooling. The equipment’s capacity and configuration still need to match the building’s loads and local climate.
DOE describes a Ventilation Integrated Comfort System (VICS) project that pairs a low-capacity, split heat-pump fan coil with a heat-recovery ventilator (HRV) or energy-recovery ventilator (ERV). The proposed integrated system is intended to provide heating, cooling, dehumidification, whole-house ventilation, filtration, heat recovery, and distribution of outdoor air in low-load homes and apartments. It is an example of a possible design—not evidence that all new rental buildings use an integrated system. DOE’s VICS project description explains the concept.
Other buildings may use separate heating and cooling equipment and ventilation equipment. Integration can reduce duplicate equipment and coordinate functions, but it does not remove the need to design for the right heating and cooling capacity or ventilation flow. A system that is efficient on paper may not deliver its intended result if equipment, ducts, or controls are poorly selected or installed.
What does mechanical ventilation do, and how does energy recovery help?
Mechanical ventilation intentionally moves air: outdoor air is supplied to the dwelling, and indoor air is exhausted. In an energy-efficient design, an HRV or ERV can transfer energy between the outgoing exhaust air and incoming outdoor air. That recovery can reduce the heating or cooling work needed to bring the incoming air closer to indoor conditions.
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Recovery equipment does not eliminate ventilation or make incoming air require no conditioning. Its job is to recover some energy from the exhaust stream as outdoor air enters. The amount of recovery and the system’s fan power matter, but a rating is meaningful only in the context of the equipment and applicable program requirements. The DOE figures below, for example, apply to a specific program provision and climate-zone context—not every product or building.
Ventilation may be arranged within each apartment or centrally for several homes. In-unit equipment places the ventilation system at the dwelling level; a centralized system serves multiple units. Both approaches can be used under the DOE program example discussed below. Their practical trade-offs depend on the building layout, airflow design, controls, climate, and maintenance plan. The choice alone does not establish that one building is more efficient than another.
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DOE Efficient New Homes Multifamily Version 2, Revision 2, dated September 15, 2025, sets out one specific example for Climate Zones 6–8: qualifying in-unit HRVs or ERVs used for whole-dwelling ventilation must meet at least 65% sensible recovery efficiency at 32°F and at least 1.2 CFM/W at one or more rating points. The provision also allows centralized heat- or energy-recovery ventilators serving more than one dwelling unit as an alternative.
Those are program requirements in the cited DOE version, not a universal code rule and not a general specification for every HRV or ERV. A project’s applicable requirements depend on its location, program version, and compliance path. For the complete context, see the DOE Efficient New Homes Multifamily Version 2 (Revision 2) requirements.
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ENERGY STAR Multifamily New Construction has prescriptive, ERI, and ASHRAE compliance paths. The program states that minimum mandatory requirements apply whichever path a project selects, and an approved Rater verifies those requirements in the field. Applicable versions and revisions depend on location. Builders and design teams should confirm the version that applies to their project through the ENERGY STAR multifamily program requirements, rather than assuming that one national example governs every jurisdiction.
Why do insulation, windows, ducts, and controls matter?
Heating and ventilation equipment operates within a building envelope. Insulation and high-performance windows can reduce heat transfer through walls and windows, changing the load the heating and cooling system must meet. Duct design and installation quality affect how well conditioned air is distributed. Ventilation rates also affect how much outdoor air the system has to condition. These factors interact: specifying efficient equipment alone does not guarantee an efficient building.
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Controls should be considered as part of the design, not an afterthought. For residents, controls determine what can be adjusted in the apartment; for project teams, their setup can affect whether heating equipment operates as intended. An in-unit thermostat or control panel is not proof of a particular efficiency level, just as a central system does not by itself indicate poor performance.
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How are systems checked during design and construction?
Design documentation and field verification help confirm that the installed system matches the project’s requirements. ENERGY STAR’s multifamily certification process calls for a design report covering mechanical ventilation, heating and cooling loads, equipment selection, duct design, and duct installation quality. Its guidance also describes Rater and Functional Testing Agent roles in reviewing design documentation and assessing installed performance.
- Establish the project requirements. The team identifies the applicable local rules and any certification program version and compliance path. ENERGY STAR’s multifamily program uses multiple paths, with minimum mandatory requirements applying across them.
- Document the design. The report addresses ventilation, heating and cooling loads, equipment choice, duct design, and installation quality. Those subjects connect the equipment specification to the building it is intended to serve.
- Review and verify the installation. A Rater and, where applicable, a Functional Testing Agent review documentation and assess installed performance under the program process. The goal is to check that the built system aligns with the documented design and applicable requirements.
These checks matter because design intent can be lost between plans and installation. The EPA’s HVAC guidance for designers and contractors states that “HVAC performance is critical to delivering efficiency, comfort, and durability.” That point applies to the full chain: loads, equipment, ducts, ventilation, controls, installation, and verification.
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What should renters look for in a new building?
Renters generally encounter these systems through building information and apartment controls, not by selecting or installing building-scale equipment. Before renting, ask the property manager how heating and cooling are provided, whether they are controlled within the apartment, and what ventilation or efficiency features the building identifies. If the property states that it has a certification, ask which program and version apply; program versions and rules can vary by location.
After moving in, follow the property’s instructions for the controls and report persistent problems to management. For example, inadequate airflow, difficulty maintaining the expected temperature, or equipment that appears faulty are symptoms to report—not reasons for a renter to open, adjust, replace, or install an HRV, ERV, heat pump, or central HVAC component. Equipment access, maintenance, and repairs are building-management responsibilities.
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ENERGY STAR says its certified homes and apartments are at least 10% more energy efficient than homes built to code, with a 20% improvement on average. Those are program-level comparisons, not a guarantee of a particular building’s energy use, utility bill, comfort, or savings. The ENERGY STAR Designed to Earn for Multifamily page provides the agency’s statement and context.
What determines whether a system is the right fit?
There is no single equipment layout that is best for every apartment building. A useful comparison asks whether the design matches its climate and loads, how ventilation is delivered, whether recovery is provided, how ducts and controls are handled, and how the finished work will be verified.
| Design question | What to evaluate |
|---|---|
| In-unit or centralized? | Whether equipment serves one apartment or multiple homes, and whether the design and controls suit the building layout. |
| Separate or integrated ventilation? | Whether ventilation equipment is separate from heating and cooling or integrated with a heat-pump arrangement, while still meeting required airflow. |
| Is heat recovery included? | Whether an HRV or ERV transfers energy between exhaust and incoming air, and which rated performance values apply to the project. |
| Will the installed system match the design? | Whether documentation addresses loads, equipment, ventilation, duct design and quality, and whether the applicable program calls for field verification. |
| Which requirements apply? | The jurisdiction’s code and the relevant certification program version, revision, climate-zone provisions, and compliance path. |
DOE and EPA program materials are useful reference points for U.S. projects, but a building’s applicable code and program requirements must be checked for its actual location. The cited DOE cold-climate recovery thresholds are one concrete example; they should not be generalized beyond their stated scope.
Frequently Asked Questions
Does every new apartment building use a heat pump?
No. Heat pumps are one way to provide heating and cooling, but the available evidence does not establish that every new rental uses them. The equipment type and layout depend on the building design, climate, and applicable requirements.
What is the difference between an HRV and an ERV?
Both are ventilation devices that transfer energy between outgoing indoor air and incoming outdoor air. The cited program materials refer to both types, but the requirements depend on the particular program provision and equipment rating.
Can a renter install a ventilation recovery unit in an apartment?
Building-scale ventilation equipment is part of the property’s mechanical system, so renters should not install or alter it. Ask management about ventilation concerns and report airflow or equipment problems through the property’s maintenance process.
Will an energy-efficient HVAC system guarantee lower utility bills?
No specific bill reduction is guaranteed by the program-level efficiency comparison. Utility costs also depend on the building, weather, rates, occupant settings, and operation of the installed system.
