Our customers speak.

Why do they love us? We get reasons every week, Cap City & Green Monster World help thousands of customers save money and make their homes more comfortable:

“Hiring CapCity was the best money I’ve ever spent in my home. We’ve lived in our home for over 12 years, and have never been able to maintain a comfortable temperature on our second floor during the summer swelter. We’ve had several contractors in over the years, and no one was able to give us an affordable solution to our problem and installed eShield insulation. Our timing was perfect, because within days of the installation, the Silver Spring region experienced a heat wave with excessive heat warnings. When we returned home from a Memorial Day festivities, we were pleasantly surprised to discover that although it was 94 degrees outside, our second floor was a comfortable 71 degrees! My kids were happy, my wife was happy, and I was happy that the whole family was comfortable. I was even more pleased that CapCity recommended an affordable solution, installed the solution with their professional crews, and delivered what they promised. I recommend CapCity to all of my friends and family.”

– Derek R.

“I just wanted to send a quick note to thank you for the work performed yesterday. Your crew was great, very professional, very nice to deal with and very respectful. Everything was explained in clear detail and a safety hazard was even brought to my attention that I wasn’t aware of. They did a great job and of course it had to be on one of the highest humidity days of the year when I know the attic had to be above 120F! We appreciate all they did and I will be checking with friends/family to see if they have any needs that you can help with.”

-Adam L.

“My energy bills used to be $300. Just a month after Cap City installed energy efficiency upgrades, my bills were down to $200! I knew I could feel the difference but I was absolutely blown away by the savings. Before Cap City’s / Green Monster Division, I had updated the kitchen, replaced the windows, and remodeled the bathroom, the whole nine yards. This is by far the best home improvement investment I have ever made. When I first bought the house the inspector told me I needed insulation in my attic but I put it off because it was something I wouldn’t see on a daily basis. Well, not only do I see the upgrade on my bills- I feel it every day. I’m actually excited to get my energy bills and my house is warm and toasty.”

                                                                                                                                      – Tina  B.

“Our nursery was always 6 degrees colder than the rest of our home in the winter. Having a cold kid was simply not an option, which meant we needed to pump the heat up in the rest of the house to keep her room warm. Cap City pointed out exactly where we were losing heat and installed the improvements in one day. We could feel the difference immediately and we’re all sleeping better! Thank you.”

– Jeremy  A.

“Your home performance advisors were here today to assess my elderly neighbor’s house. My adult son met with them and said that they were not only efficient but they were also kind, patient and very HONEST! It is gratifying to know that service of this quality still exists in this day and age of greed.”

– Lisa H.


What a pleasure it was to have Cap City & Green Monster World  guys in my home and what a great feeling of accomplishment in finally getting the house insulated and sealed! I am happily referring my neighbors to you.”

– Sherry B.



“I think your install guys are outstanding. Everyone on the team was super clean with their booties, temporary foyer tarping, and clean up at the end of the day. As a family that does not wear shoes in the house, I was really appreciative of this level of professionalism. Since I was curious, I was often asking questions, and your guys did an outstanding job of explaining what was going on, keeping me informed and giving me confidence in their work. I’ve had a heck of a lot of work done on my house in the past 2 years — we affectionately call it The Money Pit — and your team of guys really ranks at the top of the list for this level of professionalism and attention to detail.

Sam D.

I’m very happy with the energy efficiency upgrades installed yesterday. I can’t believe I’m saying this but I think my house is warmer already! I’m excited to track the savings on my bill. The workmen were polite, thorough, and professional all day long. I’m also looking forward to “stage two” with the Low-E Solar Tint windows. I know they will make a big difference year round.”

– Don B.



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