If you live up in Christian Valley or anywhere in the wooded foothills, the PG&E Public Safety Power Shutoff is just part of fire season now. The forecast turns hot and windy, the notice hits your phone, and the power's off for a day — sometimes three. No grid means no central AC in a 100°F stretch, or no furnace on an early cold snap.
For a house full of people, that goes from uncomfortable to serious quickly, and if someone in the home relies on powered medical equipment, it can be genuinely dangerous. The heat doesn't wait for the lights to come back on, and neither does a house that wasn't ready.
The good news is you can ride out most PSPS events in real comfort with a little planning. Here's how we coach foothill homeowners to prep: pre-condition the house, tighten the envelope, and set up backup power that actually runs what matters. It ties into the everyday residential HVAC and comfort work we do year-round.
Pre-Cool or Pre-Heat Before the Power Goes Out
PSPS notices come with lead time, so use it. Your house is a big thermal battery — if you charge it before the shutoff, it coasts for hours. In summer, drop the thermostat and pre-cool hard while you still have grid power, then close the place up tight. In winter, do the reverse and pre-heat so the structure holds warmth into the outage.
The hours before a shutoff
- 1Watch for the PG&E notice and note the shutoff window so you're not caught mid-afternoon.
- 2A few hours out, pre-cool the house to the mid-60s in summer or pre-heat to the mid-70s in winter.
- 3Close blinds and curtains on the sun side, then keep exterior doors shut.
- 4Fill jugs with water and freeze them — they help an off-grid fridge and add cool mass to the house.
Tighten the Thermal Envelope So Comfort Lasts
A coasting house is only as good as its envelope. Weatherstrip the doors, seal the attic bypasses where conditioned air escapes, add insulation where it's thin, and shade the west-facing windows that cook the house in the afternoon. In our older Gold Rush and foothill homes, this envelope work is often the difference between coasting comfortably for twelve hours and losing the whole house in three. It's the same sealing that lowers your bills the rest of the year, so it pays for itself outside of fire season too.
Battery and Generator Basics for HVAC
Not all backup power is equal, and this is where people get burned. A central AC compressor pulls a big surge of current the instant it starts, and most portable generators and small batteries simply can't start it — they'll bog down or trip. Be honest with yourself about what each option can actually run before you count on it in a heat wave.
What typical backup power will and won't run.
| Backup option | Realistically runs | Notes |
|---|---|---|
| Small portable generator (2–4 kW) | Fridge, fans, a window AC | Won't start a central AC compressor |
| Large inverter / standby generator | Central AC or furnace | Must be sized for the compressor surge |
| Home battery (often solar-paired) | Mini-splits, fans, fridge | Central AC only with a big inverter |
| Ductless mini-split | Cooling and heating on little power | Ideal match for battery backup |
This is one reason a ductless mini-split is such a good foothill hedge — it sips power and pairs naturally with a battery, so one zone of the house stays comfortable even when the grid is down. For a deeper look at sizing generators and batteries to your equipment, see our guide to HVAC backup power for Auburn PSPS events.
The other move is to stop trying to condition the whole house on backup power. Pick one room — usually a bedroom — close it off, and cool or heat just that space with a mini-split or a small unit on the battery. It's far easier to hold 400 square feet comfortable through a multi-day outage than 2,000, and it means everyone has somewhere to sleep no matter how long PG&E takes to bring the grid back.
Never run a generator indoors
Generators put out carbon monoxide that kills fast. Run them outside only, well away from windows, doors, and vents — never in a garage, even with the door open. Keep a working CO alarm in the house during any outage you're powering yourself.
Medical Equipment Needs a Real Plan
Plan for powered medical equipment
If anyone in the home relies on oxygen, a CPAP, or other powered medical equipment, register with PG&E's Medical Baseline program, keep battery backup on hand, and have a plan to relocate if a shutoff runs long. Don't count on the power returning on schedule — foothill PSPS events can stretch for days.
Bring the System Back Safely After Power Returns
When the grid comes back, don't slam everything on at once. Give a central AC a few minutes before you restart it — that pause lets internal pressures equalize and protects the compressor. Check the thermostat settings, swap out any filter that loaded up during smoke, and glance at the breakers in case one tripped during the outage. If the system won't restart or is behaving strangely, shut it off and call us rather than forcing it.
Get PSPS-ready before the next red-flag day
We help Christian Valley and foothill homeowners plan pre-cooling, envelope sealing, and mini-split backup that survives a shutoff. Call +1 (327) 210-5999 — same-day service in the Auburn area, 24/7 for emergencies.
Frequently Asked Questions
Only with a large inverter or standby generator sized for the compressor's starting surge. Most small portable generators can't start a central AC — they'll bog down or trip. A ductless mini-split, which draws far less power, is a much easier load to back up.
Pre-cool the house hard before the shutoff, then close it up tight and shade the sun-side windows so the thermal mass coasts. Tightening the envelope with weatherstripping and insulation extends how long that coast lasts, and a battery-backed mini-split can keep one zone comfortable throughout.
It depends on your home, but a properly sized standby generator or a battery-friendly ductless mini-split are the two most reliable options. Anyone dependent on powered medical equipment should also register with PG&E's Medical Baseline program and keep independent battery backup.
