Why an empty house matters to a vinyl floor
Vinyl plank doesn't rot or swell from humidity the way wood and laminate do. Its weak spot is heat. Planks expand as they warm, and a floating floor has only so much room at the walls. Push it too far and it can peak at a doorway or lift along a wall of glass.
The second issue is paperwork. Some warranties tie coverage to temperature. One national vinyl warranty says that if the floor isn't continuously kept between 65°F and 85°F after installation, damage may not be covered. Turning the AC off for five months could put you outside that.
The temperature ranges in makers' own documents
These are the numbers printed in the install guides and warranties we read. They differ, so find the documents for your floor. If you don't know the product, the narrowest range here is the safe one to plan around.
| Document | Range for a finished floor |
|---|---|
| National vinyl warranty (LVP/LVT) | 65°F to 85°F, continuously maintained after installation |
| SPC install guide, climate-controlled use | 55°F to 85°F |
| Same SPC guide, three-season allowance | -25°F to 155°F, floating installs only |
| Same maker's WPC guide, three-season allowance | 32°F to 100°F, floating installs only |
| SolidTech SPC guide | 55°F to 85°F for install and 24 hours after; floating use in three-season rooms rated 0°F to 140°F |
| Big-box SPC warranty | Three-season rooms and cottages must stay between 50°F and 100°F |
| Commercial SPC install guide | Room should never rise above 100°F or fall below 55°F |
What Florida's extension service says about the AC
UF/IFAS, the University of Florida's extension service, publishes a guide to closing a seasonal home. It says to leave the air conditioner set no higher than 85°F so it cycles often enough to keep indoor humidity below 55% to 60%, which holds off mold and bacteria. It adds that a dehumidifier with a drain line can help, though not as much as air conditioning.
UF/IFAS Extension in Sarasota County notes that most molds thrive when relative humidity goes above 60%, and suggests a hygrometer to measure it. For energy and mold, it recommends a summer thermostat setting no lower than 78°F.
A setting that works for the floor and the house
Put those together and you get a band. The extension guidance caps you at 85°F. The strictest vinyl warranty we read also caps you at 85°F. Setting the thermostat at 85°F exactly leaves no margin for a hot room near the glass or a thermostat in a cool hallway.
A setting in the high 70s to about 80°F keeps the house under both caps with a few degrees to spare, and keeps the AC cycling often enough to pull moisture out of the air. If your floor's own documents give a different range, use theirs.
Humidity matters more to the house than to the planks. Aim to keep it under 60%. A smart thermostat or a Wi-Fi hygrometer lets you check both numbers from up north.
Before you lock the door
- Set the AC as above and confirm it's cycling before you leave.
- Turn off the water at the meter unless you need it for irrigation. UF/IFAS recommends this to prevent flooding if a pipe bursts.
- Turn off the water heater if you'll be gone more than a month, per the same guide.
- Close blinds or drapes on sunny glass. Install guides recommend this during peak sun, and in an empty house nobody is there to do it.
- Leave the expansion gap alone. Don't let anyone caulk the floor to the baseboard or the slider track while you're gone.
- Arrange for someone to check the house after storms and power outages.
If the AC fails or the power goes out
A few hot days are part of Florida. Floating rigid core products with a three-season allowance are rated for 100°F or more, depending on the product. Glue-down floors are a different case: at least two install guides say their three-season allowance applies to floating installs only.
When you get back, walk the floor. Look for gaps that weren't there, planks lifting at doorways or along the slider, or soft spots. Take photos before anything is moved. Get the AC running and let the house cool down before judging the floor, and call the installer before pulling up any planks. Warranty claims go better with pictures and a timeline.
Choosing a floor for a seasonal home
If you're flooring a house you'll leave for months at a time, choose the product with that in mind. Ask to see its install guide and warranty, and check two things: the temperature it must be kept at, and whether it allows a three-season allowance for floating installs.
We install SPC core plank, a dense core that handles temperature swings better than softer cores. Our waterproof flooring installation page explains how we lay it on a slab. The Limited Lifetime Warranty on our floors is not transferable.
Questions People Ask
What temperature should I leave my Florida house at in summer for vinyl floors?
Leave the AC running. UF/IFAS says no higher than 85°F so it keeps humidity below 55% to 60%. One national vinyl warranty requires the floor be kept between 65°F and 85°F continuously. A setting in the high 70s to about 80°F stays under both with margin. Your floor's own documents take priority.
Can I turn the AC off while I'm gone?
It's risky for the house and possibly for your warranty. Without the AC cycling, humidity climbs and mold can start. Some vinyl warranties require the floor to stay in a set range, such as 65°F to 85°F. Only some floating rigid core products carry a three-season allowance for rooms without climate control.
Will vinyl plank buckle in a hot, closed-up house?
It can if the heat exceeds what the product is rated for or the floor has no room to expand. Makers' three-season allowances range widely, from 32°F to 100°F for one WPC line to -25°F to 155°F for one SPC line, and apply to floating installs only.
What humidity should an empty Florida home stay at?
Below about 60%. UF/IFAS aims for 55% to 60% or lower in a closed seasonal home, and notes that most molds thrive above 60%. A running AC is the best tool. A dehumidifier with a drain line helps but doesn't replace it.
Does a dehumidifier replace the AC while I'm away?
No. UF/IFAS says a dehumidifier with a drain can help but doesn't control moisture as well as air conditioning. It also doesn't keep temperature in the range a vinyl warranty may require. Use it as a backup, not instead of the AC.
What should I check when I get back?
Look for new gaps, planks lifting at doorways or along sliding doors, and any soft spots. Take photos before moving anything, let the AC bring the house back down, and call your installer before pulling up planks. Photos and dates help a warranty claim.
Sources
- Shaw vinyl warranty terms, 65 to 85 degree requirement: https://flooringmarket.com/pages/shaw-vinyl-warranty
- COREtec Pro residential installation guidelines for SPC products: https://pdmsview.shawinc.com/USFloors/COREtec-Pro/Installation/Residential-Installation-Guidelines-for-SPC-Produc
- COREtec Originals installation guidelines for WPC products: https://www.georgiacarpet.com/pages/coretec-installation-guides/coretec-originals-installation-guide.html
- Mohawk SolidTech installation guidelines (rev. Oct 2018): https://mohawk.blob.core.windows.net/mohawkflooring/pdf/install/SolidTech_Installation.pdf
- Lifeproof vinyl SPC tiles and planks warranty: https://images.thdstatic.com/catalog/pdfImages/79/793ab6dd-4276-4c3d-ad38-d9493f06f655.pdf
- AHF Contract commercial SPC installation instructions: https://www.floorexpert.com/knowledge-base/commercial-solid-polymer-core-spc-installation-instructions/
- Shaw Floorte Pro 6, 7 and 10 series installation guide: https://www.georgiacarpet.com/pages/shaw-luxury-vinyl-installation-guides/shaw-floorte-pro-6-7-and-10-series-installation-guide.html
- UF/IFAS, Closing Your Seasonal Home (FCS3154/HE887): https://ask.ifas.ufl.edu/publication/HE887
- UF/IFAS Extension Sarasota County, mold management in the home: https://blogs.ifas.ufl.edu/sarasotaco/2024/10/30/mold-management-in-the-home/