New Construction HVAC in Las Vegas: What to Check Before Your Builder Warranty Expires
Buying a newly built home in Las Vegas comes with a builder warranty, and the HVAC system is covered under it — usually for a defined period that varies by builder and component. What many new homeowners don't realize is that the most common new-construction HVAC issues often don't announce themselves until the first full summer, sometimes right around when portions of the warranty are expiring. Knowing what to check and when protects you.
Why new doesn't automatically mean problem-free
New equipment is generally reliable. The issues in new construction usually aren't equipment defects — they're installation and design issues: duct runs that were installed under time pressure, registers placed for construction convenience rather than airflow performance, systems sized by a rule of thumb rather than an accurate load calculation, and insulation or duct sealing that meets minimum inspection standards without being genuinely optimized for a home that faces 115°F summers.
These issues produce symptoms — uneven room temperatures, a system that runs constantly during peak heat, higher-than-expected utility bills — that a homeowner may attribute to "that's just Las Vegas" rather than recognizing as a correctable installation problem.
What to check during the first full summer
- Room-to-room temperature consistency — walk the house with a thermometer on a hot afternoon. Differences of more than a few degrees between rooms on the same floor, or large differences between floors, indicate airflow or duct issues worth reporting while under warranty.
- Whether the system reaches set temperature during peak heat — a properly sized and installed system should maintain your set point on a typical hot day. If it can't, that's a legitimate warranty concern, not just desert reality.
- Airflow at every register — hold your hand at each supply register. Weak or absent airflow at a specific register points to a disconnected, crushed, or blocked duct run — a common construction-phase problem.
- Unusual noises — rattling ductwork, whistling registers, or vibration can indicate loose connections or improper installation.
- Condensate drainage — check that the condensate line drains properly and that there's no water accumulation near the air handler.
- Thermostat accuracy and placement — a thermostat placed in direct sun, near a supply register, or in an unrepresentative location will manage the whole house poorly.
The upstairs problem in new two-story construction
Most new Las Vegas construction is two-story, and the most common complaint is an upstairs that runs significantly warmer than the downstairs. Some temperature variation between floors is physics. A persistent 8-10°F difference is usually correctable — through duct balancing, damper adjustment, or in some cases a design issue the builder should address. Reporting this while under warranty gives you far better leverage than raising it three years later.
Documentation to gather early
Collect and keep: the equipment model and serial numbers for both indoor and outdoor units, the manufacturer warranty registration confirmation (registration is often required within 60-90 days of installation to receive the full warranty term — verify this was done), the builder warranty terms specific to HVAC, permit and inspection records, and any load calculation documentation the builder can provide.
Manufacturer warranty registration is worth confirming specifically. If the builder or installing contractor didn't register the equipment, you may be defaulted to a shorter base warranty period without knowing it.
How to raise an issue with the builder
Document the problem specifically rather than generally — "the upstairs bedrooms measure 82°F when the thermostat downstairs reads 75°F on a 105°F afternoon" is actionable in a way that "the upstairs is hot" isn't. Take readings on multiple days, note the outdoor temperature, and submit in writing through the builder's warranty process so there's a record.
An independent HVAC assessment can also be valuable, particularly if the builder's contractor concludes nothing is wrong. A second, unaffiliated technician measuring airflow and system performance gives you documentation that isn't coming from the party responsible for the original installation.
The timing argument
Builder warranty periods for HVAC and workmanship are finite, and they often expire before a homeowner has been through enough Las Vegas summers to notice a pattern. Doing a deliberate assessment during your first full summer — rather than waiting until something clearly fails — is how you catch correctable issues while someone else is still responsible for correcting them.
Aspen Air provides independent HVAC assessments and service across Las Vegas, Henderson, Summerlin, North Las Vegas, and the surrounding valley. NV Lic. #0092214. Call (702) 612-2980.