Indoor Weather Heating & Air is the only 24/7 HVAC company that lives and works exclusively in the San Bernardino Mountains. We serve Lake Arrowhead, Running Springs, Crestline, and all surrounding mountain communities with expert furnace repair, Navien high-altitude boiler installation, Mitsubishi ductless mini-split systems, and emergency heating and air conditioning service — every day of the year.
We specialize in keeping mountain homes comfortable year-round. At elevations between 5,000 and 7,000 feet, standard HVAC systems struggle with thin air, incomplete combustion, and rapid filter clogging from pine debris. We install high-altitude-certified Navien hydronic heating systems and Mitsubishi ductless mini-splits engineered specifically for these conditions. With 47 five-star reviews and over 100 Navien units installed in the last year alone, we're the most trusted HVAC company on the mountain.
Heater died at midnight in a snowstorm? AC failed during a 95°F summer heatwave? We answer the phone 24 hours a day, 7 days a week, 365 days a year. Our 4-wheel-drive trucks are stocked with parts and our technicians live on the mountain — so we arrive fast, not in 2 hours from the valley.
Navien systems are engineered specifically for elevations above 5,000 feet. Auto-calibrated combustion logic continuously adjusts the air-fuel mixture in real time, delivering up to 95% AFUE efficiency even in oxygen-depleted mountain air. We install more Navien units than any other mountain HVAC contractor.
Perfect for mountain homes where ductwork is impractical. These systems heat and cool individual rooms with whisper-quiet operation below 45 dB — quieter than most household refrigerators.
Bi-annual maintenance costs a few hundred dollars per year and catches small problems before they become $500–$1,500+ emergency repairs. Mountain homes benefit even more from regular service because altitude and pine debris accelerate wear.
We cover the entire Rim of the World area and surrounding mountain communities throughout the San Bernardino Mountains:
We're not a valley company that drives up the mountain when it's convenient. We live here — from the Valley of Enchantment to Green Valley Lake, we proudly serve the Rim of the World community we call home. We're a true 24/7 heating company dedicated exclusively to the mountains. That means no delays, no "stuck down the hill," and no wondering if help will arrive. When you need us, we're already here — and we won't leave you out in the cold.
"Indoor Weather saved us during the coldest night of the year. They arrived in 30 minutes and had our Navien system running before midnight. Best service we've ever had on the mountain."
Yes. At 5,000–7,000 feet the air is thinner, which affects combustion. Standard furnaces burn dirtier, louder, and less efficiently. Indoor Weather installs Navien heating systems with auto-adaptive combustion designed for mountain elevations.
Furnace installations typically range from $6,000–$15,000 depending on system size. Indoor Weather installs high-efficiency Navien systems starting around $6,500 for many homes.
Yes. We provide 24/7 emergency HVAC repair throughout the San Bernardino Mountains. Call 909-414-1518 for after-hours emergencies.
Vacation rental guests often run heating and cooling at maximum capacity without efficiency-minded habits. This accelerates wear, and a failure during a guest stay means refunds, emergency costs, and negative reviews. Quarterly checks for STR properties prevent this.
Preventive maintenance costs a few hundred dollars per year. An emergency repair often costs $500–$1,500 or more — plus the inconvenience of a cold house. Over the life of your equipment, regular maintenance reliably saves thousands.
Everything you need to know about finding reliable AC services, types of systems, energy efficiency ratings (SEER & EER), common problems, maintenance tips, and cost breakdowns.
Altitude, pine debris, and extreme temperature swings make mountain HVAC systems work harder. Learn why bi-annual maintenance is essential at 5,000–7,000 feet.
Regular maintenance catches small issues — loose wires, dirty coils, worn bearings — before they become costly breakdowns in the middle of winter.
Big valley companies promise fast service but drive 1–2 hours to reach you. A mountain-based HVAC company arrives in minutes, not hours.
Spring and fall maintenance tasks every mountain homeowner should complete to keep their system running efficiently through extreme seasons.
Call us at 909-289-6201 for regular service or 909-414-1518 for 24/7 emergencies. You can also request a free evaluation.
Address: 29121 Hook Creek Rd, Cedar Glen, CA 92321
License: CSLB #988435
Hours: Open 24/7 for emergency service