Planning a getaway should be exciting—not stressful. Many Big Bear homeowners ask: What’s the best HVAC setting when going on vacation?
Set your thermostat 7–10°F higher than normal in summer (typically 78–85°F) and 7–10°F lower in winter (typically 55–60°F). This saves energy while protecting your home from humidity swings, frozen pipes, and heat-related damage. Setting your AC at a higher temperature reduces energy costs while protecting your home.
Bear Valley Plumbing, Heating and Air helps local families prep their homes before they leave town. Call (909) 584-4376 to schedule a pre-trip tune-up or smart-thermostat setup.
Why Vacation Settings Matter In Big Bear
Big Bear’s high-altitude climate brings wide day-night swings, fast cold snaps, and dry air. The wrong settings risk frozen pipes in winter, heat and UV damage in summer, humidity imbalances that warp wood or flooring, and needless energy waste if the system runs like you’re at home.
Recommended Setpoints By Season And Trip Length
Use these ranges as practical, safe targets. If you have special risks (older plumbing, crawlspace pipes, pets, exotic plants, or musical instruments), choose the conservative end of the range.
| Trip Length | Season | Normal Comfort | Vacation Setpoint | Notes |
|---|---|---|---|---|
| Weekend (1–3 days) | Summer | 72–75°F | 78–82°F | Easy rebound on return; keeps humidity in check. |
| Weekend (1–3 days) | Winter | 68–70°F | 58–60°F | Protects pipes; minimal reheat time at altitude. |
| 1–2 Weeks | Summer | 72–75°F | 80–85°F | Close blinds; consider dehumidification if home is tight. |
| 1–2 Weeks | Winter | 68–70°F | 55–58°F | Open sink cabinets; consider shutting main water if older home. |
| 3+ Weeks | Summer | 72–75°F | 82–85°F | Use smart thermostat monitoring and alerts. |
| 3+ Weeks | Winter | 68–70°F | 55–58°F | Shut main water, drain exterior lines, keep heat above 55°F. |
Humidity Targets And Why They Matter
Even in a drier mountain climate, humidity control protects your home and finishes.
• Summer target: 40–55% RH to prevent mold and protect wood and instruments.
• Winter target: 30–40% RH to reduce condensation, window sweating, and swelling wood.
• If you have a whole-home humidifier or dehumidifier, set it to these ranges. If you don’t, aim for the conservative temperature ranges above and keep blinds closed to limit solar gain. High humidity can create optimal conditions for mold growth in homes, so maintaining proper humidity levels is crucial.
Should You Ever Turn HVAC Completely Off?
Generally no. Turning the system fully off risks frozen pipes in winter, heat buildup and humidity spikes in summer, and hard restarts that stress equipment. Keeping it in “Away” or setback mode is safer and usually cheaper overall.
Smart Thermostats: Exact “Away” Workflow
Use a smart thermostat to lock in savings and peace of mind. Here’s a simple, repeatable setup you can save as an “Away” routine. Utilize vacation mode on a smart thermostat to automate temperature adjustments.
| Step | Summer Away | Winter Away | Pro Tip |
|---|---|---|---|
| Create Schedule | Setpoint 80–85°F | Setpoint 55–60°F | Name routine “Vacation – Big Bear.” |
| Enable Alerts | High temp alert: 88–90°F | Low temp alert: 52–55°F | Get push/email alerts if thresholds are crossed. |
| Fan Mode | Auto | Auto | Avoid continuous “On” to reduce energy use. |
| Humidity Control | Dehum 50–55% if available | Humidify 30–35% if available | Protects wood, finishes, and instruments. |
| Return Prep | Pre-cool 2–4 hours before arrival | Pre-heat 4–6 hours before arrival | Use geofencing or app to start early. |
Settings By System Type
• Central AC + Gas Furnace: Follow the standard setpoints above. Consider a furnace safety inspection before long trips.
• Heat Pump (including cold-climate units): Use “Heat” or “Auto,” keep setbacks modest in deep winter to avoid long recovery and expensive auxiliary heat.
• Ductless Mini-Splits: Set each head to Away (80–85°F cooling, 58–60°F heating). Close doors to unused rooms, but keep at least one head running on each floor.
• Evaporative Cooler (Swamp Cooler): Do not leave it fully off in extended heat waves if your home is tightly sealed; use limited-hour operation and ensure makeup air to manage humidity. For longer vacations, setting the AC to around 85 degrees Fahrenheit is advisable. The best thermostat setting for summer vacation is between 80 to 85 degrees Fahrenheit.
Pet, Plant, And Specialty-Item Considerations
Pets should be kept comfortable with temperatures between 76–80°F in summer and 60–65°F in winter; ensure they have water available and consider using camera monitoring for peace of mind. If you have pets, maintain a slightly cooler temperature of around 78°F to keep them comfortable. Most houseplants prefer temperatures above 60°F and consistent light, so group them away from direct sunlight and use watering globes to maintain moisture.
For sensitive items like musical instruments, artwork, and wine, maintain tighter humidity ranges—35–45% in winter and 45–55% in summer—and avoid extreme temperature setbacks to protect their condition.
Big Bear Cabin And Pipe-Freeze Safeguards
• Keep heat above 55–58°F in winter, open cabinet doors under sinks, and disconnect garden hoses.
• For long trips: shut off the main water, drain exterior lines, and consider a smart leak sensor near water heater, fridge line, and under sinks.
• If you have a crawlspace, verify insulation around exposed piping and seal foundation vents appropriately per season.
Energy-Saving Myths, Busted
Myth: Turning the HVAC off saves the most money. In reality, the recovery process can be costly and risky; controlled setbacks are safer and typically more economical. Another common myth is that closing supply vents saves money, but this actually increases static pressure and can harm your system, so it’s important to keep vents open for proper airflow. Additionally, ceiling fans do not cool rooms while you’re away—they only cool people—so it’s best to turn them off when you’re not home. Leaving AC on during vacation prevents issues like food spoilage and damage to electronics.
Pre-Trip HVAC Checklist
• Schedule a maintenance check 1–2 weeks before departure.
• Replace or clean filters for max airflow.
• Set Away temperatures and enable high/low alerts.
• Close blinds and curtains; use reflective shades on sun-exposed windows.
• Test smoke/CO alarms and thermostat batteries if applicable.
• For long winter trips: shut the main water, drain exterior lines, and place a few leak sensors.
• Unplugging unnecessary electronics while away can further reduce the overall temperature and energy costs in the home.
Return-Home Strategy For Fast Comfort
Use your app to pre-condition the home before you arrive, ensuring a comfortable temperature upon your return. Gradually resume normal schedules to reduce energy spikes and avoid unnecessary strain on your HVAC system. When the system starts up, listen for any unusual noises and check supply temperatures at a vent to ensure everything is functioning properly. If you notice the system struggling or short-cycling, it’s advisable to schedule a post-trip maintenance check to address any potential issues promptly.
When To Book A Professional Visit
If your HVAC system is over 10 years old or hasn’t been serviced in the last year, if you’ve experienced pipe-freeze scares, short cycling, breaker trips, or hot and cold spots, or if you’re adding a smart thermostat, zoning, or humidity control for the first time, it’s important to address these issues before your trip.
Bear Valley Plumbing Heating and Air can tune your system, set ideal Away routines, and install monitoring to prevent disasters while you’re gone. Call (909) 584-4376.
Resources:
- U.S. Department of Energy – Thermostat Settings
- EPA – Indoor Air Quality Tips
- ENERGY STAR – Smart Thermostat Guide
- California Energy Commission – Home Energy Efficiency
Further Reading:
- Should You Cover Your Air Conditioning Unit in Winter?
- Getting A Heating Tune-Up Before Winter in Big Bear
- How To Prepare Your Big Bear AC System for the Summer
- What Should You Do If a Pipe Bursts Under Your House?
Frequently Asked Questions
What single change saves the most while I’m away?
A 7–10°F setback plus closing blinds typically delivers the biggest impact with minimal risk.
Is 55°F really safe in Big Bear winters?
For most homes, yes. If you have a history of freeze issues or exposed piping, use 58–60°F and shut off main water.
How far should I raise AC in summer?
Most homes are safe at 80–85°F. Use 78–80°F if you have pets, delicate finishes, or a lot of south-facing glass.
Do I need a dehumidifier?
Big Bear is generally dry, but tightly sealed homes or swamp cooler users may benefit. Target 40–55% RH in summer.
Will a smart thermostat really help?
Yes. Remote control, alerts, geofencing, and humidity support reduce risk and typically pay back in one or two trips. Smart thermostats enable homeowners to manage their HVAC systems remotely using a smartphone.
If you are looking for a Big Bear plumbing, heating & air conditioning contractor, please call (909) 584-4376 or complete our online request form.
Category: HVAC Maintenance & Repair
