NetZero Insulation

We used NetZero Insulation for our previous home in Lone Tree and were incredibly impressed with the pride their team has in their work, as well as their competitive pricing. They installed insulation in my parents' home in Castle Rock, and in our new home in Castle Rock. They finished last July, our Nest noted that we used 80 hours less AC in August compared with July. Our home is SO much more comfortable, and the noise insulation has increased dramatically as well. Our family highly recommends Ryan and his team at NetZero.

NetZero air sealed my attic/garage and installed new insulation lat week. I was skeptical on how much we’d really notice, but the temperature difference of my top floor and rooms over the garage has been incredible. Ryan and team were incredibly clean, professional, and quick. They operated in unison with each of the 7 workers knowing exactly their role. Very impressive company/staff. Highly recommended!!

Over the summer of 2025 I took bids on re-insulating the attics of my 70s house. Excel Energy was offering bonus rebates so a good time to get it done. I got four bids and all were within the same ballpark. However, none of the other bidders wanted anything to do with removing the old insulation or dealing with the Excel rebates. Net Zero’s bid included both of those items for the same price. On work day they showed up with a LARGE truck with all kinds of gear and a crew of 5. They were totally professional throughout the process and did a great job of protecting the interior of the house. I am so glad I chose Net Zero for this project!

NetZero did a thorough job replacing our home's attic insulation. We contacted them initially to set up a quote and Sean came out to see the home. Despite not having attic access Sean properly assessed the current inadequate insulation and prescribed a reasonable plan to address the situation. Within 24 hours I received a quote where local Xcel rebates were already applied and would be handled by NetZero. Their quote was in line with other businesses but I felt assured by the thoroughness of Sean's walk-through and the details of the job we discussed. We set up the job for two weeks later. Sean arrived with his crew right on schedule in the morning. He reviewed the work with the crew and lead and reviewed everything again with me. The crew laid down floor protection and covered up furniture and equipment in the room where they were working. Throughout the day the crew lead, DJ, was communicative and friendly and everyone was working like crazy. A little after midday they had completed the work and walked me through everything they'd done in detail by showing me pictures of all the sealing, duct connecting, foam, and blow-in insulation they added. The work looked sharp and thorough. I was worried that there'd be some clean-up, especially since they were cutting two attic access points, but when they left everything looked as clean as before they arrived. Even the work on the attic access cuts was clean and looks good. Finally, immediately we've been able to tell the difference with our home holding temperatures much more steadily. We used to fall into the 50s every night and now the house holds a much higher average temperature. We can already see lower usage on our utilities online tracking and the furnace kicks on much less often. Highly recommend NetZero insulation! Thank you Sean, Ryan, DJ and team.

I had my attic insulation removed and re-insulated by Netzero. I do a lot of research before I hire anyone to do a project, and Netzero checks all the boxes. The owner, Ryan Donnell, showed up at the scheduled time to look at our project, and he was very professional and knowledgeable. We received the quote within 24 hours, and it was reasonable for the amount of work that needed to be done. He put me on the schedule, and he contacted me a day before the project. They showed up on time, and D.J. and his crew did a remarkable job. I was amazed by the whole process from start to finish. The almost 70-year-old rock wool attic insulation was no doubt the nastiest stuff I've ever seen, and they efficiently removed all that nasty stuff. When they were done with the removal process, they air sealed the entire attic. D.J. wanted me to check out the work, and all I can say is they all really take a lot of pride in their work, and it shows in their attention to detail. Even when they sealed up the attic access wall, they didn't like the way it looked, so they covered it in sheet foam. Now that our house is insulated to the correct depth and air sealed, it feels much more comfortable. Also, we used to hear a lot of road noise from the nearby highway, and the noise level has dramatically decreased. Thanks, guys, for making our house comfortable again.

We had a great experience with Ryan and team. From the initial quote, to the execution of the project. The team was very thorough, took the time to explain the before and after and left it spotless. Highly recommend them!

Ryan and his team did a great job. Exceeded my expectations. All the work that was done very timely. My home is So much more comfortable now, and it Will be even more efficient with the new Energy, saving furnace I installed recently. Thank you To the net zero team for doing such a wonderful job. I highly recommend them for any insulation work that needs to be done.