Last updated 4 October 2026
ThermoLet is run by me, Martin, a sole trader trading as ThermoLet. You can reach me at [email protected], and my full name and a postal address for formal correspondence are available on request. Email and ask.
These terms cover using this website and signing up, and they set out the basis on which I'd provide the service if you go on to become a host. They're written to be read, not to be impenetrable. But they are the agreement between us, so the bits that limit what I promise mean what they say.
Filling in the form on this site registers your interest. It doesn't commit you to anything, and no payment details are taken. I'll email you to arrange a call, and you're free to walk away at any point before we set your property up. Creating a ThermoLet account doesn't commit you either: you can set a property up without paying anything. Equally, I might not be able to take you on, either because your thermostat isn't supported yet or because I've filled the spots. I may also decline or suspend a property if I reasonably believe the service can't run reliably or safely with its equipment, its configuration or its circumstances.
Your subscription begins when you start it at checkout in your ThermoLet account, which you do when you switch your first property on, or from the Billing page. Nothing before that point is a contract for the service. Checkout is run by Stripe, which takes your card details; I never see them.
Your first subscription starts with a 30-day free trial. A card is needed to start it, and nothing is charged until the trial ends. If you cancel before then, you're never charged. The free trial is once per account: if you cancel and later subscribe again, the first payment is taken when you subscribe.
You'll see when your trial ends on the Billing page, and Stripe emails you a receipt for every payment.
If a payment can't be taken, Stripe emails you and tries again over the following days, and ThermoLet keeps running while it does. You can pay what's owed at any point from the Billing page in your ThermoLet account, with the same card or a different one.
If it still can't be collected, ThermoLet stops managing your property's heating until it's paid, and I'll email you to say so. Your thermostat is left in whatever state it was last in (see ending it), so check it. Pay from the Billing page and ThermoLet picks up again.
If you're a consumer buying the service online, then on top of the cancel-any-time above you have a legal right to cancel within 14 days of your subscription starting, without giving a reason.
ThermoLet starts working for your property as soon as your subscription starts, because that's the point of it. By starting your subscription at checkout, you're asking me to begin the service during the cancellation period, and you're acknowledging that once it has been fully performed you lose the right to cancel it. You keep the right for the subscription itself: if you use it, I can charge you only for the service you actually had, in proportion to the month or year you paid for. Your first subscription starts with a 30-day free trial, so cancelling in the first 14 days of it costs you nothing.
To cancel, email me and say so. There's no form to fill in, though you're welcome to use the model cancellation form in the Consumer Contracts Regulations if you'd rather. I'll refund anything owed within 14 days of being told.
I may change the price for future months or years. If I do, I'll email you at least 30 days before it takes effect, and you can cancel at any point before then rather than pay the new rate. A change never applies to a month or year you have already paid for, and it is never backdated.
If your price is fixed, this does not override that. A fixed price stays where it is for as long as you stay subscribed, whatever I charge new hosts.
ThermoLet reads your booking calendar and, around your check-in and checkout times, tells your thermostat which mode to be in: your normal schedule from the warm-up time ahead of an arrival and while guests are in, and, while the property is empty, the mode in which your thermostat holds only its own minimum temperature setting, so your normal schedule doesn't run.
It changes the mode and nothing else. It never sets a target temperature, and it never talks to your boiler directly.
ThermoLet doesn't change your thermostat's minimum temperature setting. If your insurer requires a minimum temperature, set it on your thermostat and ThermoLet leaves that setting unchanged. Check your own policy for the required temperature.
If you set a temperature limit, ThermoLet also reads how warm the property is, and may put the thermostat back to its schedule while the property is above that limit. That cancels a boost, whoever put it on. If it was yours, your thermostat's app may report that someone else altered it; if a guest set it at the wall, the heating simply goes back, with no explanation to them. Leave the limit unset and it won't do this.
ThermoLet is a convenience and a cost-saving tool. It is not a frost-protection system, a property-protection system, or a safety system, and you must not rely on it as one.
If your property could be damaged by the heating failing to come on (burst pipes in a cold snap, for instance), you need protection that doesn't depend on my software, your internet connection, or a third party's servers. That might be your thermostat's own minimum temperature setting, a separate monitor with an alarm, or someone checking the property. You should have an independent means of protecting your property against freezing or heating failure. ThermoLet should not be your property's only protection.
More specifically, I can't and don't guarantee:
You and your guests can change the thermostat whenever needed, at the wall or in your provider's own app, and ThermoLet cannot lock you out of your own heating. ThermoLet may subsequently return it to the settings in your heating plan. If you want it left alone for good, disconnect it in your thermostat provider's app and it loses the ability to send any command at all, immediately.
You're responsible for keeping your booking calendar accurate and your account details up to date, and for telling me if something looks wrong. Please don't share your login.
Nothing here limits my liability for death or personal injury caused by negligence, for fraud, or for anything else the law doesn't allow me to limit. If you are a consumer, nothing in these terms affects your statutory rights.
Subject to that, and because this is a low-cost subscription: my total liability to you is limited to the amount you've paid me in the 12 months before the problem arose. Subject to the same limits, I'm not liable for indirect or consequential loss, for lost income or bookings, for increased energy costs, or for damage arising from your not keeping independent protection for your property of the kind described above.
If something goes wrong because of ThermoLet, or you're unhappy with the service, email me at [email protected] and tell me what happened. I'll look into it and reply as soon as I reasonably can. I'd rather fix it and make it right than argue about a clause.
You can cancel at any time by emailing me. I may suspend or end the service if the fee goes unpaid (see if a payment fails), if the service is misused, if I reasonably believe it can no longer run reliably or safely with your property's equipment, configuration or circumstances, or, with as much notice as I can reasonably give, if I stop offering ThermoLet. If I shut it down, I'll refund anything you've paid for a period you won't get.
When ThermoLet stops managing a property, it stops sending heating commands. Your thermostat remains in its current state, so you should check it and restore your normal schedule if needed.
That applies whether your subscription ends, a payment goes unpaid, or you archive or disconnect the property. ThermoLet doesn't put the thermostat back to your schedule first, so if the property was empty at the time, the heating may be left at your minimum temperature.
I may update these terms. If a change materially affects you as a paying host, I'll email you before it takes effect, and you can cancel if you don't like it. The date at the top always reflects the current version.
These terms are governed by the law of England and Wales, and disputes go to the courts of England and Wales. If you live in Scotland or Northern Ireland, you can bring proceedings in your own courts.
How I handle your personal data is covered separately in the privacy policy.
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