61 insulation contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in National City: Attic Construction, CR Score 61/100; 4.9★ from 316 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Attic Professional, posts 24/7 hours; ranked #2 of 61.
Most-reviewed: Mauzy Cooling, Heating, Plumbing, and Electrical, 4,710 Google reviews at 4.8★, the most of 61 ranked; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
61 National City insulation contractors are ranked here by CR Score, from ten published factors. 6 are open 24/7, 36 open Saturdays and 30 open Sundays, based on posted hours. The median Google rating is 5.0★ across 61 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Attic Construction | 61 | 4.9★ (316) | San Diego, 6 mi away | Sat · Sun · Evenings | Overall |
| 2 | Attic Professional | 61 | 5.0★ (197) | Santee, 13 mi away | 24/7 | Emergencies |
| 3 | Attic Projects Company | 60 | 4.9★ (888) | San Diego, 15 mi away | Sat · Sun | — |
| 4 | Attic Heroes | 59 | 5.0★ (106) | San Diego, 9 mi away | Sat · Sun · Evenings | — |
| 5 | Advanced Insulation System | 59 | 5.0★ (126) | San Diego, 11 mi away | Sat · Sun | — |
| 6 | California Attic & Build | 58 | 5.0★ (144) | San Diego, 13 mi away | Sat · Sun | — |
| 7 | Mauzy Cooling, Heating, Plumbing, and Electrical | 58 | 4.8★ (4,710) | El Cajon, 13 mi away | 24/7 | Most reviews |
| 8 | A Affordable Insulators & Services | 58 | 4.7★ (31) | Baldwin Park, 2 mi away | Sat · Sun · Evenings | — |
| 9 | Green Faith Attic Solutions | 58 | 5.0★ (40) | San Diego, 8 mi away | Sat · Sun · Evenings | — |
| 10 | Miramar SD Insulation Inc. | 57 | 5.0★ (31) | San Diego, 15 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 316 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Santee, 13 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 197 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 15 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 888 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 9 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 106 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 11 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 126 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 13 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 144 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in El Cajon, 13 mi away
Ranked #7 because of its Google rating and review volume: 4.8★ from 4,710 Google reviews, the most in National City.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Baldwin Park, 2 mi away
Ranked #8 because of its Google rating and trade focus: 4.7★ from 31 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 8 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 15 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 31 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 11 mi away
Ranked #11 because of its Google rating and trade focus: 4.5★ from 31 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Carlsbad, 17 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 235 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 4 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 6 mi away
Ranked #14 because of its Google rating and trade focus: 3.7★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in La Mesa, 7 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 5 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chula Vista, 6 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 6 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Spring Valley, 9 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 83 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Chula Vista, 7 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 10 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in El Cajon, 13 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Diego, 9 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in National City
Ranked #24 because of its Google rating and trade focus: 4.0★ from 3 Google reviews, listed on Google as “Insulation contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in San Diego, 11 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Insulation contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
National price ranges in USD, not adjusted for National City. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Attic insulation | $1,700 | $2,100 | $2,500 | Per attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range | October 2026 |
We scored 61 National City insulation contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In National City data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |