The Northcrest Window Health Check
Your windows aren't broken. They're just costing you money.
Most failed windows look fine from the inside. Under a thermal imaging camera, they look like the photos above — bright orange and yellow where heat is moving through the glass and frame. In summer, that's outdoor heat coming in and driving up your AC bill. In winter, it's the opposite — heat from your home escaping out.
Either way, your HVAC is working harder than it should, and you're paying for it every month.
The Window Health Check is a free 20-minute thermal imaging walk-through of your home. We show you which windows and doors are leaking energy, which ones are sealing properly, and exactly where the problems are — on the spot, on the screen, in your own house.
The Window Health Check is a free, no-obligation diagnostic. Here's how it works.
Our Approach
At Northcrest, every project starts with a conversation — not a sales pitch.
Every Northcrest installation is delivered as The Northcrest Full-Frame System™ — a defined, repeatable product backed by written guarantees, a structured two-visit consultation process, and a 5-year labor warranty. We come out, measure every opening, talk through your priorities, and leave you a written estimate range the same day. No “today-only” pricing. No pressure to decide faster than you want to.
We install the full Andersen window lineup and ProVia entry doors, giving us the range to match the right product to your home and your budget. Installation is handled by experienced full-frame replacement crews — doing the work the right way.
The result is a process that respects your time, and a finished product you'll notice every day.
Our process is simple and thoughtful.
Every project follows the same four steps: a free in-home consultation, a clear written quote, careful full-frame installation, and a final walkthrough to make sure it's right. No surprises, no pressure, no shortcuts.
Explore what we offer below.
Our Services
Every project starts with a free in-home consultation and ends with windows or doors that are properly installed, properly sealed, and built to last. Take a closer look at what we offer below.
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We install the full Andersen window lineup — 100 Series, 200 Series, 400 Series, A-Series, and E-Series — using full-frame replacement. That means we remove the entire existing unit down to the rough opening, address any rot or damaged structure underneath, re-flash to current standards, and finish to a premium level. It's the only method that fixes the underlying causes of window failure rather than covering them up. We'll help you choose the right Andersen series for your home, your climate, and your budget.
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We install ProVia Heritage and Legacy entry doors — fiberglass and steel doors built for New England weather and finished to look right on a New England home. Like our window installs, every entry door goes in with proper flashing, weatherproofing, and trim work, so the door performs as well as it looks. We'll walk you through styles, glass options, hardware, and finishes during your consultation.
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We install Andersen patio doors — sliding and hinged — sized and configured to fit your existing opening or designed into a new one. Patio doors take more abuse than almost any other opening in the house, which is why proper full-frame installation matters even more here than with standard windows. We seal, flash, and finish every patio door installation to the same standard as the rest of our work.
Meet the Team
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![Michael Holzman, founder of Northcrest Window & Door Specialists, Derry NH]()
Michael Holzman
FOUNDER & OWNER
Michael founded Northcrest to do window and door replacement the way he always wanted to see it done — honestly, without pressure, and built around what's actually right for the customer. His background spans real estate, finance, and design consultation in the window industry, and that mix shows up in how he runs every project: thoughtful about design, clear on numbers, and focused on the homeowner first.
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Corrin & Layla
Office & Marketing Support
Corrin is Michael's fiancée and Northcrest's behind-the-scenes operations partner. She handles the office side of the business. The dozens of small details that keep projects running smoothly.
Layla, Corrin's daughter, handles photography and helps with marketing — capturing project photos, contributing to our social media, and bringing a fresh creative eye to how Northcrest shows up online.
Together, they're a big part of why Northcrest feels less like a contractor and more like a family business that genuinely cares about getting it right.
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![Margot, the golden retriever and unofficial mascot of Northcrest Window & Door Specialists]()
Margot
Chief Morale Officer
Margot is Northcrest's four-year-old golden retriever and the unofficial face of the company. She doesn't measure windows, write quotes, or show up to install days — but she keeps the home office running on the strength of her tail wags and reminds us that the best businesses are the ones built around the people (and dogs) you love.
If you spot her in our photos or on social media, give her a wave.
