Heating and cooling account for close to half of a rental property's total energy use, and unlike a homeowner, you're often paying that bill for temperature settings a guest chose and then left running when they went out for the day. A smart thermostat alone helps. A smart thermostat wired into a few automations is where the real savings show up, typically in the range of 10 to 25 percent off annual heating and cooling costs, depending on your climate and how aggressively you use scheduling.
If you don't already have an IFTTT account, signing up is free and every automation below runs on it.
Why this adds up fast
On a property with $300 in monthly HVAC costs, a 15 to 20 percent reduction works out to roughly $600 to $720 a year, often enough to pay for the thermostat itself several times over in the first year alone. The bulk of that saving doesn't come from the thermostat being "smart" in the abstract. It comes from three specific automations most hosts never fully set up.
Automation 1: Vacancy setback tied to your booking calendar
The single highest-value automation is also the simplest in concept: let the property's temperature relax when nobody's there, and bring it back to guest-ready before the next check-in.
If you've already built a calendar-based automation for check-in or smart lock access (using the same iCal-to-IFTTT pattern from our calendar sync guide), extending it to your thermostat takes one more Applet:
Applet: Vacancy setback IF: Event ends on your Airbnb Bookings calendar THEN: Set the thermostat back several degrees from your normal occupied range
Applet: Pre-arrival recovery IF: New event starts on your Airbnb Bookings calendar THEN: Return the thermostat to guest-ready temperature a few hours ahead of check-in
This is the automation responsible for most of the reported 8 percent-plus annual HVAC savings from setback scheduling alone, and it requires no guest cooperation at all since it runs entirely on your booking data.
ecobee is the most direct way to build this, whether you're triggering off your booking calendar or off your own location as a fallback:
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Create an ecobee vacation when Google Calendar event starts
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Set Ecobee to Home comfort profile when you arrive
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Resume Ecobee schedule nightly
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Set ecobee to Away mode when you leave home
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Automation 2: Temperature limits (guest range locks)
Guests don't pay your utility bill, which means a guest who's cold sets the thermostat to 85, and a guest who's hot sets it to 60, with no real cost to them for either choice. Nearly every smart thermostat built for rentals supports a locked range, so guests can still adjust for comfort but can't run the system into the ground.
A guest-controllable range of 65 to 78°F is the standard starting point most hosts land on. Set this once during installation, mention the range in your house manual so guests aren't confused by a "locked out" feeling, and you've closed off the most expensive failure mode: a system left running at an extreme setting for days.
Most thermostats set the hard limits natively in their own app, but pairing that with an IFTTT alert gives you a heads-up the moment a guest pushes toward either edge of the range, or overrides the schedule entirely:
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Get IFTTT notification when Google Nest temperature rises
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Send IFTTT notification when Google Nest temperature drops
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Turn on Google Nest Thermostat Eco Mode when ComEd average price exceeds threshold
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Get an IFTTT alert when your ecobee schedule is overridden
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Automation 3: HVAC and equipment alerts
The quietest way a rental bleeds money is a malfunctioning system nobody notices until the monthly bill arrives. A thermostat or smart plug that monitors HVAC power draw can flag it the same day: a compressor drawing more power than baseline, or a system that's been running continuously with no corresponding change in temperature, both show up in the data hours after they start, not weeks later. Catching this early is often the difference between a quick fix and a $300+ repair.
A whole-home energy monitor like Sense is the more general-purpose way to build this. It watches every major appliance, including your HVAC system, and can email or notify you the instant something turns on or off outside its normal pattern:
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Get an email when a Sense device turns on
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Get an Email When a Sense Device Turns Off
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Get a notification when your Sense Energy Monitor turns off
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A fourth automation worth adding: water heater standby
It's not a thermostat automation, but it belongs on the same list. Water heaters left running at full temperature during vacant stretches waste a meaningful amount of standby energy, some estimates put it as high as a quarter of total water heating cost during unoccupied periods. If your water heater supports a vacation or eco mode, tying it to the same vacancy trigger you use for your thermostat setback closes another gap with almost no extra setup.
A retrofit water heater controller like Aquanta can pick up this exact job, syncing its own away mode to your thermostat's occupancy status, and flagging leaks, high energy use, or a dropped connection on the tank itself: Sense + Aquanta.
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Sync Aquanta mode with Ecobee Smart Home or Away
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Get an SMS when Aquanta detects a leak
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Get an SMS alert when Aquanta detects high energy use
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Get an SMS alert when your Aquanta goes offline
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Choosing a thermostat that actually supports this
Not every "smart" thermostat is built with rental hosts in mind, and the difference usually shows up in one specific area: access sharing. You need to grant remote access without handing over your personal login, and you need an interface simple enough that a guest doesn't call you confused about how to change it.
The ecobee Smart Thermostat Essential is frequently recommended over the popular Nest Learning Thermostat for this exact reason. Nest's access-sharing model is more restrictive, which becomes a real limitation once you're managing guest access at scale. The Nest Learning Thermostat (4th Gen) is still a strong pick if you're managing shared access carefully, and its newer Matter support means broader smart home compatibility going forward. For hosts on a tighter budget, the Honeywell Home T9 covers the core scheduling and remote-access features at a lower price point.
If you're running more than a couple of properties, or want an automation platform to run the vacancy-setback and temperature-limit logic across all of them rather than configuring each thermostat's native app individually, a Z-Wave thermostat connected to a smart home hub gives you one dashboard to manage the whole portfolio.
The T9 connects to IFTTT under the broader Honeywell Home service, which is also where its water-leak sensors live, worth pairing with your thermostat automations if you're already building out equipment monitoring for the property:
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Get an SMS when Honeywell Home detects a water leak
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Turn on Honeywell Home A/C when Weather Underground detects high heat
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Set Honeywell Home temperature on schedule
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Get IFTTT notification when Ecobee changes Smart Home/Away
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The bottom line
A smart thermostat by itself saves a little. A smart thermostat automated around your actual booking calendar, with a locked guest range and an alert system watching for equipment problems, is what turns "a little" into a real, measurable line-item reduction on your utility bill, and it runs in the background without you touching a single setting once it's configured.
Ready to put your utility bill on autopilot? Sign up for IFTTT free and connect your first Applet today.
FAQs
How much can a smart thermostat actually save on a vacation rental?
Typically 10 to 25 percent off annual heating and cooling costs, depending on climate and how aggressively you use scheduling. On a property with $300 in monthly HVAC costs, that's roughly $600 to $720 a year, most of it coming from vacancy setback scheduling rather than the thermostat itself.
What's the real difference between ecobee and Nest for a rental?
Access sharing. ecobee's sharing model is built to hand off remote access without giving up your personal login, which scales better once you're managing guest access across one or more properties. Nest's sharing model is more restrictive, though it's still a solid pick if you manage shared access carefully.
Do I need to tell guests about the temperature limits?
It helps. Mentioning the guest-controllable range in your house manual prevents guests from feeling "locked out" when they hit the edge of the range, and most of the friction around locked thermostats comes from guests not expecting it rather than the limit itself.
Should I automate my water heater along with the thermostat?
Yes, if your water heater supports a vacation or eco mode. Tying it to the same vacancy trigger you use for the thermostat closes a real gap. Standby energy waste on a water heater running at full temperature during a vacant stretch can be as high as a quarter of its total water heating cost.
Do I need a smart home hub to run these automations?
No. ecobee, Nest, Honeywell Home, Sense, and Aquanta all connect to IFTTT directly through their own service. A hub only becomes useful if you're trying to centralize a large mixed-brand setup across several properties.
