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Most existing US homes pair a fuel-burning or electric furnace with a separate central air conditioner sharing one duct system, one thermostat and one indoor blower. Heat pumps change that arrangement by running the refrigerant cycle in both directions, so a single outdoor unit both heats and cools. ENERGY STAR notes that a heat pump can deliver up to three times more heat energy to a home than the electrical energy it consumes, which is why they keep spreading beyond the mild-winter states where they started.

There is no national contractor licence in the United States. Each state decides who may install and service heating and cooling equipment, and many cities add their own registration or permit requirements on top. California, for example, issues a C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor classification through the Contractors State License Board, and CSLB lets anyone run an instant licence check by licence number, personal name or business name. Other states place HVAC under a mechanical or general contractor board, and a handful regulate it only at the municipal level. Search your own state's licensing board by name and check the licence before work starts, not after.

The refrigerant rules are the part that is genuinely the same everywhere. EPA's Section 608 regulations, made under the Clean Air Act at 40 CFR Part 82 Subpart F, require anyone who maintains, services, repairs or disposes of refrigeration and air conditioning equipment to hold technician certification, earned by passing an EPA-approved test. There are four types: Type I for small appliances, Type II for high-pressure equipment such as a residential split system, Type III for low-pressure equipment, and Universal for all of them. Apprentices working under the close supervision of a certified technician are exempt, and the credentials themselves do not expire.

That certification also controls who can buy the refrigerant. Under EPA's sales restriction, only certified technicians, or an employer who gives the wholesaler written evidence of employing one, may purchase refrigerants for stationary air conditioning equipment, and wholesalers have to keep invoices showing the purchaser's name, the date and the quantity. If a contractor cannot say which Section 608 type they hold, that is a reasonable thing to ask about before they open the refrigerant circuit.

Since January 1, 2023, US residential cooling and heating equipment has been rated using SEER2 for seasonal cooling efficiency, EER2 for cooling efficiency at a single hot design condition, and HSPF2 for seasonal heating efficiency on a heat pump. The trailing 2 marks a revised test procedure that loads the equipment against more realistic duct static pressure, so a SEER2 figure is not directly comparable with an older SEER number on a legacy unit's label. The federal minimums themselves are codified at 10 CFR 430.32(c)(5).

The part that surprises people moving between states is that those minimums are not uniform. The Department of Energy splits the country into three regions for central air conditioners. The Southwest region is Arizona, California, Nevada and New Mexico. The Southeast region covers Alabama, Arkansas, Delaware, Florida, Georgia, Hawaii, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, the District of Columbia and the US territories. The North is everything else. Southeast standards apply to split-system air conditioners; Southwest standards apply to split systems and single-package units.

How compliance is judged differs too, and it matters to the homeowner rather than only the factory. In the North the standard attaches to the date of manufacture, so a legally built unit can be installed later. In the Southeast and Southwest it attaches to the date of installation, which means installing an older, lower-efficiency unit in those states is the installer's violation even if the equipment was made years earlier. DOE says it enforces this and publishes a reporting address for consumers who believe an illegal unit was installed. If you are in a southern state and a quote is unusually cheap because of leftover stock, ask directly whether the model meets the regional standard.

Any appliance that burns fuel can produce carbon monoxide if it is damaged, badly vented or starved of combustion air. The Consumer Product Safety Commission reports that more than 200 people die each year in the United States from unintentional non-fire carbon monoxide poisoning associated with consumer products, with heating equipment a major contributor. CPSC urges a yearly professional inspection of all fuel-burning home heating systems, covering furnaces, boilers, fireplaces, wood stoves and water heaters along with their chimneys, flues and vents, and it recommends a CO alarm in the hallway near the bedrooms in each sleeping area.

Treat an alarm as real. Get everyone outside into fresh air first and call 911 or the fire department from outside, then have the appliance inspected before it is used again. Do not try to find the source yourself while the house is still occupied. If you smell gas, leave immediately and call the gas utility's emergency number from outside or from a neighbour's house.

A replacement should begin with a measurement of the house, not of the old equipment. ENERGY STAR is explicit that installing properly sized HVAC equipment is essential to getting the best performance and comfort, and sizing is driven by the building: square footage, orientation, window area and glazing, insulation levels, air tightness and the local design temperature. Matching the tonnage of a 25-year-old unit simply carries forward whatever mistake was made then, and oversized cooling equipment short cycles, which leaves the air clammy because the coil never runs long enough to pull moisture out.

The ductwork is the other half of the job and the half most often skipped. Undersized returns, crushed flex runs and leaky connections in an unconditioned attic or crawlspace will hold back any equipment, no matter how high the SEER2 rating. Expect a competent contractor to look at duct sizing and sealing, at the condensate drain and its safety switch, and at the electrical circuit and disconnect serving the outdoor unit.

Finish by getting the paperwork in order. Ask who pulls the mechanical permit and schedules the inspection, since that varies by city; confirm the model and serial numbers on the invoice match what was installed; register the equipment with the manufacturer within the registration window, because many warranties shorten sharply without it; and keep the startup readings the technician recorded. Those numbers are what a future technician will compare against when something changes.

Most of what keeps a system alive is unglamorous. Change or wash the filter on the schedule the manufacturer gives, keep the outdoor coil clear of grass clippings, cottonwood and shrubs, keep the condensate drain flowing, and have combustion equipment inspected annually as CPSC advises. A cooling tune-up before the first hot spell and a heating check before the first cold snap catch the parts that fail under load rather than at idle.

Duct cleaning is sold far more often than it is needed. EPA's position is plain: it does not recommend that air ducts be cleaned routinely, but only as needed. The situations EPA describes as warranting cleaning are substantial visible mold growth inside hard-surface ducts, infestation by rodents or insects, and ducts so clogged with dust and debris that particles are actually being released into the home. EPA also cautions against the routine use of chemical biocides and sealants inside ducts, noting that questions about their safety and effectiveness remain and that little research demonstrates most biocides are effective there. If a contractor proposes fogging a biocide through your system as a matter of course, that is a reason to get another opinion.

ENERGY STAR certification sits above the federal minimum, and the current central air conditioner and heat pump requirements took effect on January 1, 2023. The cold climate designation is the one to look for in northern states, since it requires third-party verified performance tested down to 5 degrees Fahrenheit rather than only at mild conditions. Certified equipment is also what most incentive programs key off, so the label often decides eligibility.

Incentives in the US come from three separate places and they stack differently by address. Utility and state programs are the most local: ENERGY STAR's Rebate Finder takes a ZIP code and returns rebates and special offers available near you, and your own electric or gas utility's website is worth checking directly. Federally, the Energy Efficient Home Improvement Credit under section 25C covered a percentage of the cost of qualifying heat pumps, central air conditioners, furnaces, boilers and heat pump water heaters, subject to annual caps, for property placed in service on or after January 1, 2023 and before December 31, 2025. Because that window has closed and the rules have changed since, check the IRS page for the credit's current status before counting on it, and confirm any program's requirements before you sign, since most require certified equipment and a licensed installer.