A little setup before you leave town means you come home to a comfortable house instead of a hot, stuffy one, and your energy bill doesn’t punish you for the trip. The trick is doing it the right way for a Texas summer, which is not simply switching the AC off. Here’s how to set your HVAC and smart thermostat so the house takes care of itself while you’re gone.
Why ‘off’ is the wrong move in a Texas summer
It’s tempting to flip the system off entirely and figure you’ll cool the place back down when you get home. In a Forney July, that’s a costly mistake. With the AC off, a closed-up home heats up fast and, more importantly, humidity climbs with it.
That warm, damp air is hard on a house. It invites mold and mildew, can warp wood furniture, floors, and cabinet doors, and leaves everything feeling musty when you walk back in. Whatever you saved on energy gets eaten up by the damage and the days it takes to dry the place out. The goal isn’t to stop running the system. It’s to run it less, intelligently.
Setting a smart away or eco setpoint
The right approach is a higher “away” or “eco” cooling setpoint: warmer than you’d keep it at home, but cool enough to keep the air dry and moving. The system cycles on now and then to hold that line, knocking down humidity and keeping the house from baking, while using far less energy than full comfort cooling.
Most smart and Wi-Fi thermostats have a dedicated away or vacation mode built for exactly this. You set the away temperature once, and many will automatically return the home to your normal comfort setting on a schedule or when you head back. If you have an older programmable thermostat, you can do the same thing manually with a vacation hold at a higher setpoint.
Don’t push the setpoint as high as it will go just to squeeze out a few extra dollars. Once indoor humidity climbs, the air starts to feel heavy and that musty smell takes hold, and the few cents you saved isn’t worth the cleanup. A moderate setback that still lets the system run a short cycle now and then is the sweet spot for a Forney summer.
Raise the setpoint to save energy, but keep the system cycling enough to manage humidity. The aim is a house that’s warm and dry while you’re gone, not one that’s hot, damp, and growing mold.
Geofencing and remote alerts
This is where a smart thermostat really earns its place when you travel. A couple of features turn it from a fancy dial into a quiet house-sitter.
Geofencing
Geofencing uses your phone’s location to know when you’ve left and when you’re heading home. The thermostat eases into away mode after you go and can start cooling the house back to comfortable as you get close on the return drive, so you don’t run an empty house cold for hours or walk into a warm one.
Remote alerts
Connected to your Wi-Fi, a smart thermostat can text or email you if the indoor temperature or humidity climbs past a limit you set, or if the system loses power. You can’t fix a failure from out of town, but an alert means you can call a neighbor or call us before a small problem turns into a week of damage. That early warning is the whole point.
It’s worth setting these thresholds with your house in mind. A temperature alert a few degrees above your away setpoint catches a real failure without pinging you every time the system cycles, and a humidity alert is the one that flags trouble brewing before anything looks wrong. Pair the alerts with a backup contact who has a key, and a week away stops being something you have to worry about.
Your pre-vacation HVAC checklist
Run through these in the day or two before you head out. None of it takes long, and it’s the difference between a worry-free trip and a nagging “did I leave the AC running right?”
- Put in a fresh filter. A clean filter keeps airflow strong while you’re gone, so the system cycles efficiently and doesn’t strain through a week of running unattended.
- Set your away or eco setpoint. Raise the cooling temperature several degrees above normal: warm enough to save energy, cool enough to keep humidity in check.
- Turn on away or vacation mode. Use your smart thermostat’s built-in mode, or place a manual vacation hold on a programmable one so it doesn’t follow your usual daily schedule.
- Enable geofencing if you have it. Let the thermostat handle the transition into away mode and the cool-down before you return.
- Set up remote alerts. Turn on temperature, humidity, and power-loss notifications, and confirm the thermostat is connected to your Wi-Fi.
- Close blinds and curtains. Blocking direct sun keeps rooms from heating up, so the system has less work to do holding the away setpoint.
- Check your ceiling fans. Fans cool people, not empty rooms, so leaving them running just wastes energy while you’re away. Switch them off.
- Line up a backup contact. Give a neighbor or family member a key and our number so someone can act if you get an alert.
If your trip is long or your system has been acting up, a quick pre-vacation tune-up is cheap insurance. We confirm everything’s running clean and catch the small issues, like a weak part or low airflow, before they leave you with a problem you can’t see from a thousand miles away.
If you’d like a quick once-over before you leave, or help setting up an away schedule that fits your home, we’re glad to take care of it. Reach a real person at 469-728-7113 for same-day service. We work in English and Spanish, hold Texas A/C License #51447, and serve homes across Forney and the nearby Kaufman County towns.
Home Automation FAQs
Should I just turn my AC off completely when I leave for vacation?
Not during a Texas summer. With the system fully off, indoor temperatures and humidity climb fast in a closed-up Forney home, and that warm, damp air invites mold and can warp wood furniture, floors, and trim. The smarter move is a higher ‘away’ setpoint that keeps the system cycling occasionally, so you save energy without letting the house get hot and humid enough to cause damage.
What temperature should I set the thermostat to while I’m away in summer?
A common approach is to raise the cooling setpoint several degrees above your normal comfort temperature: enough to cut runtime, but not so high that humidity takes over. The right number depends on your home, so use it as a starting point. A smart thermostat’s away or eco mode handles this automatically and can bring the house back to comfortable before you return.
What if the power goes out or the AC fails while I’m gone?
That’s exactly what remote alerts are for. A smart thermostat connected to Wi-Fi can text or email you if the indoor temperature or humidity drifts past a limit you set, or if it loses power. You can’t fix it from the beach, but you can call a neighbor or call us before a small problem becomes a houseful of hot, humid air. We handle calls across Forney the same day.
Do I really need a tune-up before a trip?
It’s not required, but it’s cheap insurance. The last thing you want is your AC quitting while no one’s home to notice for a week in July. A pre-trip check confirms the system is running clean and catches the small issues, like a weak capacitor, low airflow, or a struggling part, before they leave you with a problem you can’t see. We’re glad to take a look before you go.
Owner of Lexany’s Heating & AC. Family-owned in Forney since 2011 — most days he’s the one on the truck doing the work himself. Bilingual (English/Spanish).