Top-Rated Insulation Installers in Allentown, PA

3 local companies ranked by 44 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

3Companies
44Google reviews
4.8★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated insulation installers in Allentown are Custom Weatherization LLC (4.9★, 19 reviews), Keystone Spray Foam of Allentown (4.9★, 14 reviews), ASI Professionals (4.4★, 11 reviews).

Insulation installers in Allentown, ranked 3 listed

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  1. 1
    Custom Weatherization LLCTop pickMost reviews
    4.9 (19 Google reviews)
    1855 Weaversville Rd, Allentown, PA 18109
    Call (610) 861-5290WebsiteGoogle reviewsDirectionsEmail [email protected]
  2. 2
    Keystone Spray Foam of AllentownTop pick
    4.9 (14 Google reviews)
    1303 N Kiowa St Unit 107, Allentown, PA 18109
    Call (610) 467-3180WebsiteGoogle reviewsDirections
  3. 3
    ASI ProfessionalsTop pick
    4.4 (11 Google reviews)
    382-394 W Whitehall St, Allentown, PA 18102
    Call (610) 797-9272WebsiteGoogle reviewsDirectionsEmail [email protected]

Together these 3 companies average 4.8★ across 44 reviews. Custom Weatherization LLC has the most reviews (19).

Ranked by Google rating weighted by review count, collected September 2026. Rankings are never paid for. How we rank and how we make money.

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What a insulation costs in Allentown

Typical installed priceVaries by area

Price depends on which areas you insulate (attic, walls, basement) and how much air sealing is needed. Ask each company for a price per area and the R-value you end up with, so quotes are easy to compare.

Rebates open in AllentownNone confirmed right now

Financing or future programs may still help. Check the rebate page before you sign.

Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.

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Why insulation matters in Allentown

In Allentown, the average January low is -4°C (24°F), colder than 44% of the 123 cities we track. Sealing air leaks and topping up the attic usually pays back fastest here. Basement walls and rim joists are often the next biggest heat loss in older homes.

Most rebate programs pay only after an energy assessment, and some need one before the work too. Book it first.

Source: Open-Meteo historical weather data, 2015-2024.

Before you hire a insulation installer

  1. Ask whether they will air-seal before insulating, and what they will seal (attic hatch, pot lights, pipes, top plates).
  2. Ask for the R-value before and after for each area, and the material and depth they will install.
  3. Ask whether your rebate needs an energy assessment before and after the work, and who books it.
  4. Ask how they handle ventilation and any old insulation that could contain vermiculite (asbestos risk).

Before you call anyone, check what insulation rebates you can get in Allentown. Many programs require approval or a registered contractor before work starts.

Planning more upgrades? See the top-rated heat pump installers, solar installers, home battery installers in Allentown.

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