Measured film and shading retrofits for the sun-facing glass of older offices
TL;DR Glarefold surveys the glass facades of existing offices, hospitals and showrooms, finds the panes that let in the most heat and fixes only those, with selective film or external shading. Before-and-after logging shows the cooling saved. Owners pay per project, and the measured result is what sells the next one.
India built a whole generation of glass-fronted offices before energy codes had any teeth, and the west and south faces of those buildings cook every afternoon. The Cooling Action Plan says shading, better glazing or low-E coatings can cut daily cooling demand by 30%, and that films, blinds and screens also reduce solar heat gain[1]. It also expects national cooling demand to rise about eight times by 2037-38[1].
So why don't owners act? Replacing glass means scaffolding and empty floors. Generic tinting is sold by the square foot with no promise about bills, and dark film makes offices so gloomy that staff switch the lights on anyway.
Nobody tells the owner which panes actually matter.
Reframe. The seed wanted dynamic, electronically tinting windows run by AI. That glass is expensive, and the category's best-funded US maker raised over US$1 billion and still went through Chapter 11 in 2024[2]. For existing Indian buildings we keep the goal (less solar heat, more daylight) and drop the switching glass.
Glarefold starts with a two-day survey - thermal imaging and pyranometer readings by orientation, plus a few weeks of indoor temperature and AC run-time logging in sample rooms. Software ranks every facade zone by heat gain per rupee of fix, and that usually points to a minority of panes on two faces.
Those panes get spectrally selective film, which blocks infrared but lets visible light through, and the worst cases get fixed or motorised external louvres. Glarefold buys film from manufacturers rather than making it. After the install, logging repeats in the same rooms so the owner sees the change in temperature and run hours for themselves.
Owners of older offices, private hospitals, showrooms and coaching centres with lots of glazing pay per project. Facility managers bring it to the owner when tenants moan about hot desks near the windows.
There's no public price for measured facade retrofits in India, and installers price film per square foot. My assumption is a targeted project lands at ₹3–15 lakh per building.
BEE now publishes energy-efficient retrofit manuals for existing commercial buildings and has moved on to the Energy Conservation and Sustainable Building Code 2024[3]. Indian film manufacturers sell spectrally selective and IR-rejection architectural films[4], so good material is available locally. And hotter summers keep pushing AC bills up.
There's no public figure for commercial window-film or shading retrofits in India. The Cooling Action Plan estimates that stricter ECBC compliance could cut commercial cooling capacity needs by about 13% by 2027-28 and 23% by 2037-38[1], and windows are one of the biggest levers it lists.
Treat that as a ceiling on the problem, not as your revenue.
Film makers sell through dealers and installers[4], who apply film by area and measure nothing. Electrochromic glass makers sell to new premium buildings[2]. Energy auditors mention glazing in their reports but don't install anything.
The gap is one firm that diagnoses, fixes only the panes that matter and proves the effect.
| Difficulty | Moderate (40/100) |
| Starting capital | ₹45–90 L |
| Time to launch | 4–6 months |
The work isn't complicated. Credibility and crews are the hard bits, because savings depend on weather, occupancy and AC condition, so your measurement method has to hold up. Fitting film neatly on high facades needs trained crews and access equipment, and one sloppy job kills the referral.
No sector licence for film and shading work. A few rules still shape each job.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust AI to make the final call on glass compatibility. A cracked pane is a liability claim, so that check stays with the maker's rules and a trained person.
Want to work out the AI layer for Glarefold? Talk to Yash →
Here's what can go south -
I like this as a sensible, low-capital service business for a founder from facade, HVAC or energy audit work. It won't scale like software though, and that's fine.
Prove one thing first - five buildings with at least a 2°C drop in afternoon temperature near the glass, and owners happy to give a reference.
Plan for roughly ₹45–90 L, mostly for survey kit, logging equipment, access equipment and trained crews.
No sector licence. You need the usual company and GST registration, work-at-height insurance, and approval for external louvres where the building requires it.
Yes, older glass offices exist in every hot city. Check local building codes, alteration approvals and safety rules first.
The free Glarefold validation kit has the line-by-line capital breakdown, the effort scoring, the code and safety checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for owners and facility managers, and 5 assumptions to test. Download the kit →
Thinking about building Glarefold or something close to it? The make-or-break work is a measurement method owners trust more than an installer's brochure, and I'm happy to help you get that right. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.