Thermal-as-a-service

The archive’s adoption gap has a structural cause: passive thermal systems eliminate ongoing energy purchases, removing the incentive for utilities, HVAC manufacturers, and large builders to deploy them. A thermal-as-a-service (TaaS) model — where a service provider owns the equipment and sells thermal comfort as a monthly fee — directly addresses this without changing the physics.

Cross-page pattern

The model is not invented from nothing. The archive already assembles its components:

Page	Contribution
Why hasn’t passive thermal scaled?	Names the structural barrier: no recurring revenue for the entities that could deploy at scale.
Cool Cell architectural climate-control	Quantifies the savings pool: ~$3.50/ft²/year at $0.10/kWh. No operating electricity for cooling.
Night sky radiant cooling potentials in New Mexico	Provides independent field data: 25–89% power savings vs. conventional cooling across NM climate zones.
Zomeworks shipping container prototype	Shows a standardized, relocatable unit — the asset a service provider could own, deploy, and reclaim.
Dear shareholders	Baer’s 2004 franchise vision: trained teams with roll-formers operating in regional markets. The financing wrapper was missing.
Retrofit-first passive thermal	The deployment logic: attach systems to what already exists; keep the building looking ordinary.

The model

The closest working analog is the solar PPA (power purchase agreement): the provider owns the hardware, the building owner buys the service at a rate below their current utility bill, and the provider keeps the margin.

Applied to passive thermal:

provider installs + owns system → building owner pays monthly fee → provider captures margin

The fee is priced below the building’s current cooling cost. The provider is responsible for all maintenance. The building owner pays nothing upfront.

This resolves the archive’s named barriers directly:

Barrier	How TaaS addresses it
Split incentives	Provider owns the equipment and is paid to make it perform
No recurring revenue	Monthly fee replaces the utility bill as the revenue stream
Builder familiarity	Builder signs a service contract rather than learning new technology
Upfront capex	Shifted to the provider; building owner pays nothing to install

Why the archive’s systems are good TaaS candidates

Three properties make Cool Cell and Double Play unusually well suited:

Near-zero operating cost. Cooling runs by thermosiphon — no compressor, no electricity. The provider’s marginal cost after installation is low, widening the margin.
Very long lifespan. Davis’s career shows passive systems outlasting active ones by decades. The provider amortizes capex slowly and the asset holds value.
Standardized unit. The container prototype offers a relocatable platform. If a building owner exits, the provider can redeploy the asset — the same residual-value logic that makes solar panel leasing work.

Hard problems the archive doesn’t resolve

Metering. A solar PPA bills kWh produced. Thermal output is harder to measure directly. Billing likely requires an avoided-cost model (what the building would have paid) — which requires a baseline and creates disputes.

Building transitions. When property sells, the thermal system is embedded in the structure. The contract must be assumable by the buyer or the provider must be compensated — a friction point solar PPAs have encountered.

Climate specificity. The NSRC data shows massive savings in New Mexico’s arid climate. In humid climates, night-sky radiative cooling is less effective (cloud cover, dew point). The model is strongest in the Southwest first.

The missing piece in 2004

Baer’s Dear Shareholders letter envisioned regional franchises with roll-formers — the deployment network was already conceived. What was missing was the financing structure that makes the capex burden disappear for the building owner. The solar PPA model, which solved exactly this problem for photovoltaics, did not yet exist as a template. The container prototype in 2026 suggests the standardized-unit piece is back in development; the financing wrapper remains the open question.

A validated analog: Passive House’s scaling stack

A 2026 research round on promoting passive thermal technology found a directly transferable proof point: the Passive House Institute’s most successful scaling case (Massachusetts — 2,500 certified units built, 35,000 more in the pipeline) combined comfort-framed messaging, institutional bulk deployment as a living demonstration (Austria housed 3,500 students/year in Passive House dormitories), and a community organization providing ongoing hands-on technical support — not certification/training alone. That third element, sustained technical support rather than a one-time sale, is the same shape as the TaaS provider’s ongoing-maintenance role described above. See Promoting passive thermal technology for the full case study and four others.

New conclusion

archive physics + solar PPA structure + standardized unit = deployable TaaS model

The archive’s systems are not missing performance. They are missing a business model that converts a one-time installation into a recurring revenue stream for the deployer. TaaS does that — and the archive’s own engineering properties (near-zero operating cost, long lifespan, relocatable hardware) make it a better TaaS candidate than most active HVAC systems.

Real-world models (2026 research)

Three service models have emerged from research:

Cooling-as-a-Service (CaaS): Customer pays per ton-hour of cooling. Provider owns equipment. CPI/BASE pilots in Colombia, Dominican Republic, Jamaica claim 23% cost savings and 49% emissions reduction. Flagship projects planned for South Africa, India, Mexico.
Heat-as-a-Service (HaaS): 15–20 year ESCO contracts. Engie/Heineken 30 MW solar thermal project in Seville is the flagship (60% EU co-funded). WBCSD explicitly states the model is not yet self-sustaining without subsidies.
Insulation-as-a-service (performance contracting): In Sabac, Serbia, the district heating operator borrowed EUR 2.5M to insulate 40 residential buildings, repaid over 12 years from energy savings. This is essentially passive thermal performance contracting — the closest existing model to what Zomeworks-style systems would need.

US residential case studies

The US has exactly two residential thermal-as-a-service case studies, and both reveal structural fragility:

Sealed (NY): The only US residential ESA provider. 20-year contracts financed by NY Green Bank. Packages ~$6–7K (air sealing, insulation, thermostats). ~300 customers by end 2018. Savings: 5% electricity, 20–25% heating fuel. Geographically locked to New York due to Green Bank financing.
BlocPower (national): 15–20 year heat pump leases targeting underserved communities. In Ithaca, 10 of 6,000 planned buildings were electrified before financial distress. Restructuring underway in 2025; crowdfunding investors face total loss. The model depended on federal subsidies (IRA, DOE) that proved politically fragile.

Neither model is robust or scalable. The pattern: savings guarantees that cannot actually be guaranteed, combined with dependence on politically unstable subsidies.

The metering problem

CaaS/HaaS meter BTUs delivered. Passive thermal delivers comfort through avoided demand — the absence of cooling/heating load. This is measurable (indoor temperature monitoring vs modeled baseline) but less intuitive than a utility meter. Solving this measurement gap is the key enabler for any service model applied to passive thermal.