Can an HOA restrict a heat pump or mini-split?

The rule

Heat pumps and mini-splits are not solar devices, and that distinction drives most of
the answer. The strongest homeowner protections in the reviewed states apply to solar
energy systems: California Civil Code section 714
voids restrictions that effectively prohibit or unreasonably restrict a solar energy
system, Florida Statutes 163.04
protects solar collectors and other renewable-resource energy devices, and similar
provisions exist in [Hawaii],
Washington, and
Virginia.

For heat pumps and mini-splits, The official sources reviewed for California, Florida, Massachusetts, Oregon, Virginia and Washington did not identify a specific statewide protection. Local law, governing documents, contracts,
and general property law may still affect the result. That means the association's
authority comes from the governing documents and architectural review — the same tools
that govern any exterior modification — and the limits come from general reasonableness
standards rather than a heat-pump-specific statute.

What the rule means in practice

• Association rules govern placement and appearance. Screening, setback, and
  appearance requirements in the governing documents apply to outdoor units unless a
  statute overrides them.
• The solar statutes do not carry heat pumps. A rule that is unlawful for a solar
  panel may be enforceable for a heat pump unit, because the statutory protection does
  not extend to it by name.
• Permits and codes are separate. The ENERGY STAR air-source heat pump reference
  and [DOE's heat pump guidance]
  explain sizing (a contractor should verify system size with a Manual J calculation)
  and cold-climate performance; mechanical and electrical permits are decided by local
  code, not by the association.
• Reasonableness still applies. A rule that effectively prevents any heating
  improvement — rather than regulating where and how a unit is installed — is the kind
  of restriction most likely to be challenged successfully.

What may still be required or restricted

• Placement, screening, and noise rules from the governing documents, within
  reasonableness limits.
• Mechanical and electrical permits from the local authority.
• Condominium-specific layers for common walls and shared systems.
• Solar easement statutes (for example, Oregon's ORS Chapter 105
  and Massachusetts G.L. c.184 s.23C)
  protect solar access, not heat pump placement.

Facts that could change the answer

• What the governing documents say about exterior equipment and modifications.
• Whether a state has enacted a heat-pump or electrification protection after the
  sources reviewed here.
• Whether the unit is on the owner's property, a common element, or an exclusive-use
  area.
• Whether local noise or mechanical codes impose their own limits.
• Whether the rule is a reasonable placement standard or an effective ban.

Practical decision path

1. Read the governing documents and any written appearance or placement rules.
2. Confirm whether any state statute protects the specific equipment.
3. Prepare an architectural application with the unit's specifications and sound data.
4. Complete the mechanical and electrical permit steps the local authority requires.
5. Keep the written decision and all correspondence.

Before work begins, obtain the written requirement from the association, landlord, permit office, or serving utility and keep the record.

Records to keep

Keep the governing documents, the architectural application and written decision, the
unit's manufacturer specifications and sound-rating data, and the permit records. These
are the records used if a denial or dispute is reviewed.

When professional advice may help

If an association denies a heat pump application or imposes a rule you believe is
unreasonable, consider advice from an attorney familiar with common-interest-development
law in the state where the property is located.