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Thermawood Retrofit Double Glazing Testimonials

In June 2020 we decided to retro-fit double glazing to our 1950s Rotorua home. The wooden windows were in reasonable condition and we have gas central heating and good ceiling and underfloor insulation. But Rotorua winters are cold and with gas prices rising we could see no point in losing heat out the single glazed windows, or the gaps between the opening windows and frames. Chris was around within a few days with his tape and explained the options. We elected to go for the best quality glass given the impact on total budget was minor. The job got under way within a month using a single bay of our double garage as the workshop. Windows are removed, modified and fitted with pre-assembled double glass units and re-installed within the working day – a few windows per day. I cannot speak highly enough of the team that did the job. Rob and Mike are true craftsmen, the likes of which is becoming a rarity in today’s “throw-away” society. They paid attention to detail and took pride in getting each window back in place and functioning as it should. They went the extra mile to add screws to critical Tenon and Mortise joints. Rob and Mike consulted on each day’s work programme and went out of their way to accommodate other renovation work my wife and I were doing. We are so pleased with our new double-glazed wood frame windows and endorse Chris Smith Glass if you are considering a similar upgrade.

Peter ClarkRotorua

"We were impressed by the standard of workmanship shown by Kevin & Jim, and have been equally impressed by the effect of the Thermawood double glazing installed in our 1920's house earlier this winter"


“It has been just over six months now since we had the wooden joinery in our 1950’s character home retro fitted with double glazed glass panes by Chris Smith Glass. Initially it was my husband who insisted this work be done to our home, I didn’t get too excited about it as I was unsure about the benefits. We are now in the thick of Winter and the benefits are very obvious. I always loved our character home and believed part of owning it meant I had to put up with feeling a bit cold in Winter; not so now, as our home holds the warmth that comes in during the day and doesn’t lose the heat our gas fire provides. This is the first year that I have EVER had to turn the heating down! It feels to me like our gorgeous older home, structurally and aesthetically always pleasing, has now also been brought up to date in terms of its ability to be a warm and healthy home. I am really delighted with the difference this has made to our home; and as an added bonus, the difference to our power bills means that the money we spent on getting the job done, will actually pay itself off in time.”


Really impressed by the quality of the product and the professional and personal service, no detail was too small. Kevin and Jim were happy to change our windows in stages rather than doing the whole house at once. I wouldn't hesitate in recommending them.


Thermawood has definitely increased the warmth of our home it is a lot drier and there is no condensation. We had a couple of tricky windows and they ensured the job was completed to perfection. Jim and Kevin were recommended to us by friends and we would not hesitate to also recommend them, they are very professional and a pleasure to have around our home.

Rex and SharonMasterton

We had been waiting for a suitable retro double-glazing system for some time, after significant research we chose Thermawood with the stand out features being the special venting system and being endorsed by the New Zealand Green Building Council. We have noticed a huge difference in our home. Jim and Kevin have great product knowledge. Kevin and Jim are efficient, unobtrusive and professional.

Michael & PipMartinborough

We are very impressed with the system, after doing extensive research we decided on Thermawood which has certainly lived up to expectations. There is no more condensation and a big difference in heat retention. Jim and Kevin are very efficient and provided a hassle free service.

John & ShirleyCarterton

We are very pleased with the effectiveness of retro-fitting of 8 kitchen windows. It is so much warmer now, a very efficient and professional team, a pleasure to have around our home.

Heather & TonyGreytown

I couldn’t recommend anyone higher than the Thermawood team. They were excellent to have around the home, very neat and tidy. Since the installation there has been a big difference to the warmth of my home.

Mrs MLansdowne

"Having had the house fully Double Glazed at Easter the benefits are fantastic. The house is drier, warmer and a pleasure to get up to in the early mornings at 3am. The guys did a great job William and John and even impressed the neighbours by the way they worked and cleaned up. Thanks Guys"

Mary & PeterTurangi

"From start to finish all I can say is wow. We have an old Villa that had been relocated 15 years ago. Steve arrived at our house showed us what could be done not what couldn’t be done (a different company) he looked at all the windows, left us with some info sheets and an assessment sheet. My husband and I went through what Steve had left and decided to use the low-e glass. The workmen came out two weeks later, John & Will were great guys always friendly. The results from having the Thermawood System put in feel great and the heat retention in rooms that have been done is outstanding. We hope to do the rest of the house next year."

Dianne WilloxKaraka

"We had double glazing installed by Ecosee in our rental property at Arthur's Pass. This replaced old double glazing which had failed. We were very pleased with the clean lines of the new retro-fitted glazing and have noticed a good increase in the heat retention in the house. We experience some very rapid changes in the weather here from 5 degree frosts to plus 5 degree temperatures within a very short period of time and the new glazing has stood up very well to these rapid temperature changes"

Chris StewartField Centre Supervisor, Department of ConservationArthur's Pass