How to Stay Warm in an RV in Winter: Furnace, Skirting, Space Heater

Furnace, skirting, thermal curtains, draft sealing. Space heater when on shore power.

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🔎 30-Second Summary

To stay warm in an RV during winter, it's essential to run the furnace, use skirting to block wind, and seal drafts. Supplementary heating can be achieved with a space heater when connected to shore power.

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System context: To understand how RV heating work, see RV Heating & Cooling.

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Short answer: Run the furnace, add skirting to block wind under the rig, use thermal curtains, seal drafts. A portable electric space heater can supplement when on shore power. According to Camping World and Good Sam, proper insulation and draft sealing make a big difference.

Winter RVing means fighting cold from below (underbelly) and through windows. This guide covers furnace use, skirting, curtains, and sealing—plus when a space heater helps. See our RV heating and cooling systems guide, furnace troubleshooting, and winterization guide for water line protection.

1. Run the Furnace

Keep the furnace maintained—clean filters, check propane. If it's not working, see RV furnace not working. Set the thermostat to a comfortable level; cycle as needed to save propane.

2. Add Skirting

Wind under the rig steals heat. Skirting (foam boards, vinyl, or purpose-built RV skirting) blocks airflow and keeps the underbelly warmer. Helps protect water lines too. A recommended solution for full-timers in cold climates.

3. Thermal Curtains

Windows are major heat loss points. Thermal or blackout curtains reduce heat escape. Reflective foil in windows (when parked) adds insulation. Draw curtains at night.

4. Seal Drafts

Weatherstrip doors and windows. Use draft snakes at door bottoms. Check around slide-outs. Seal any gaps that let cold air in.

Furnace still not firing? If your furnace won't start after these checks, propane, 12V power, or sail switch may need professional diagnosis. Request local RV HVAC service below.

5. Supplement with Space Heater

When on shore power, an electric space heater can supplement the furnace and save propane. Choose models with tip-over and overheat protection. See space heater vs furnace for cost comparison.

6. Winterize When Storing

If you're not using the RV in winter, winterize the water system to prevent freeze damage. Heating and plumbing go together in cold weather.

If furnace, propane, or heating system issues persist after DIY checks, a licensed RV or HVAC technician can diagnose and repair. Request local RV HVAC service below.

📋 Winter RV Prep Checklist

Furnace inspection, propane check, skirting prep, condensation management. Use before cold-weather trips.

Download Checklist

Frequently Asked Questions

How do I stay warm in an RV in winter?

Run the furnace, add skirting, use thermal curtains, seal drafts. A portable electric space heater can supplement when on shore power.

Do I need skirting for winter RVing?

Skirting significantly reduces heat loss from the underbelly and is recommended for extended cold-weather stays.

Can I use a space heater in my RV?

Yes, when on shore power. Electric models with safety features are fine. Never use unvented propane heaters indoors.

How cold is too cold for an RV?

Depends on insulation and heating. Well-prepared RVs can handle single digits with furnace, skirting, and draft sealing. Water lines are the weak point—keep heat on or winterize.

Related RV Troubleshooting Guides

If you're diagnosing RV electrical or appliance problems, these guides may help:

Tools Used in These Repairs

Diagnosing RV electrical and mechanical issues often requires a few basic tools. Recommended tools used in these guides:

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DecisionGrid content is independently researched. We evaluate products using technical specifications, wattage math, and compatibility checks—not sponsor relationships. Affiliate links do not influence rankings. Our safety-first philosophy prioritizes voltage protection, load calculations, and real-world use cases. Content is reviewed quarterly; specs are verified and broken links fixed. We do not accept sponsored placements or paid rankings.

About the Author

Adam Hall — Founder, DecisionGrid

DecisionGrid's technical guides are written and reviewed using:

  • System-level electrical analysis
  • Real-world RV troubleshooting patterns
  • Manufacturer documentation review
  • Field-tested diagnostic workflows

Our goal: Clear, structured troubleshooting — not guesswork.

About DecisionGrid Our Methodology Editorial Standards

Updated March 2026 · Reviewed for technical accuracy

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Last updated: March 2026 · Reviewed for technical accuracy

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RV AC Acting Up? Let's Pinpoint It Before It Gets Expensive

Most rooftop no-cool calls are airflow, voltage, or start support—not a random refrigerant guess. Pick the closest match so dispatch routes you correctly.

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Pick the closest match — this determines whether this is a quick fix or something that can damage the system if it keeps running.

Not sure yet is normal—bring your pass/fail notes; a tech can verify power, airflow, and sealed-system signs without rerunning guesswork.

If you're unsure, pause here. Forcing starts or swapping parts without confirming voltage or airflow is one of the fastest ways we see minor issues turn into compressor damage.

A local tech can confirm voltage, airflow, and start components in minutes — this is usually the fastest way to avoid guessing and unnecessary part swaps.

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