In a Las Vegas summer, the attic above your ceiling gets extremely hot, and in many homes the air conditioning ducts run right through it. Two upgrades address that heat in different ways: adding attic insulation and sealing the ducts. NV Energy’s PowerShift home improvement program includes both types of weatherization work, with specific requirements.
Key takeaways
- Attic insulation slows heat moving from the attic into the rooms.
- Duct sealing stops cooled air from leaking into the attic.
- Read the current program requirements before the work if you plan to apply for a utility rebate.
Option A: attic insulation
Attic insulation sits on the attic floor above your ceiling. More insulation slows the flow of heat from the hot attic into the living space, so the air conditioner has less heat to remove. Insulation is rated by R-value, a measure of resistance to heat flow. NV Energy’s program sets minimum starting and final R-values for attic insulation to qualify.
Option B: duct sealing
Ducts carry cooled air from the air handler to each room. Leaky joints and connections let that air escape into the attic before it reaches you. Duct sealing closes those leaks, and duct insulation reduces the heat the ducts pick up. NV Energy’s program requires before-and-after leakage measurements for duct sealing.
Side-by-side comparison
| Attic insulation | Duct sealing | |
|---|---|---|
| What it addresses | Heat flowing through the ceiling | Cooled air leaking from ducts |
| Where the work happens | Attic floor | Ducts in unconditioned spaces |
| How results are shown | Starting and final R-values | Leakage measured before and after |
| Utility program | Weatherization category | Weatherization category, with or without duct insulation |
Which one fits
If your attic insulation is thin or uneven, insulation is often the first step. If rooms far from the air handler stay warm, or you notice dusty or hot attic air around vents, duct leaks may be part of the problem. Many homes benefit from both. A qualified contractor can measure duct leakage and check insulation depth before recommending either.
NV Energy program basics
NV Energy’s PowerShift program offers home improvement rebates for weatherization work including duct sealing, duct sealing with insulation, and attic, wall and floor insulation. Its 2026 requirements note that weatherization rebates require a whole-house electric cooling system, that documents must be submitted within 180 days of completion, and that rebates are limited to one-time installations. Program terms change, so read the current version before you schedule work.
Tip: Ask your contractor to record the starting and final insulation depth, or the before-and-after duct leakage, in writing with photos. Programs often require this information, and it is useful for your own records.
Permits
The City of Las Vegas guide lists installation of insulation on existing single-family homes where other permits are not required as permit-free. Changes to ductwork or heating and cooling equipment are different: installing or changing any part of a heating or cooling system needs a permit in the City of Las Vegas. Ask whether your duct work requires a mechanical permit.
Who to hire
Insulation and duct work are specialty trades. Check the contractor’s license, classification and monetary limit with the Contractors Board, and ask whether they are familiar with the utility program’s requirements. See How to Check a Nevada Contractor License.
Walls and floors too
The same NV Energy program also covers wall insulation for exterior-facing walls and floor insulation between conditioned and unconditioned space, each with its own R-value requirements. In most Las Vegas homes the attic is the largest and easiest area to improve, but if you are opening exterior walls during a remodel anyway, ask whether adding wall insulation at that stage makes sense. It is far easier while the walls are open.
Planning it into a remodel
Insulation and duct work fit naturally into a larger project. If a kitchen or garage conversion is already bringing trades into the attic, add the insulation and duct sealing to the same scope and schedule them after any new wiring or duct runs are complete, so the new insulation is not disturbed.
Safety in the attic
Las Vegas attics can be dangerously hot in summer. Attic work is often scheduled for cooler parts of the day or year. Homeowners should avoid going into the attic in extreme heat and should step only on joists or boards laid across them, never on the insulation or ceiling between.
Common mistakes
Covering attic vents or recessed lights incorrectly, adding insulation over leaky ducts without sealing them and starting work without reading program requirements are the most common mistakes.
Frequently asked questions
Does more insulation always help?
Up to a point. The program sets a target final R-value for attic insulation.
Can I do the work myself and still get a rebate?
Check the current program terms for who may perform the work.
Will this replace a new air conditioner?
Not necessarily, but reducing heat gain and leaks can reduce the load on any system. See Replacing a Water Heater or Air Conditioner: Permits and Planning.
For outdoor shade, read Planning a Patio Cover in Las Vegas.