How to Protect Outdoor Equipment During Yard and Exterior Work
Why this matters
The outside of a house carries other trades' equipment at waist height: the air conditioner's outdoor unit, a standby generator, the gas meter and its regulator, the electric meter and disconnect, the irrigation backflow assembly, the pool equipment pad. Painters, pressure washers and landscapers work right up against all of it, and the damage they do is almost never a direct hit. It is plastic sheeting over a condenser that then runs all afternoon, a pressure-washer stream into a disconnect, a string trimmer chewing the insulation off a refrigerant line, mulch piled over a regulator vent. Each one becomes a service call for a different trade, and the first question that trade asks is who was working there last. This card is the walk-through and the handling rules that keep you out of that conversation.
Safety first
- Gas smell near the meter or a gas appliance outside: stop work, move everyone away upwind, no engines started, no switches. Call the gas utility or 911 from a distance.
- Water and electrical gear: never aim water, from a hose or a pressure washer, into a meter, a disconnect, a receptacle, a generator or a pool equipment panel. If water has gone into one, stay off any wet ground near it, do not open it, and tell the homeowner to call an electrician before anything is switched.
- A standby generator can start by itself, on its weekly exercise schedule or when the power fails. Treat its exhaust and its moving parts as live at all times, and keep its air intakes and exhaust clear.
The procedure
1. Walk the yard and the walls before you unload
Do it because you cannot protect what you have not seen, and the walk takes ten minutes against a day of work.
Walk the full perimeter of the house and the work area with the homeowner if possible. List every piece of outdoor equipment and where it is. Look for the lines that connect them, because the lines are what get hit: the refrigerant line set and its small control wire from the outdoor unit to the house, the electrical whip from the disconnect to the unit, the generator's conduit and gas line, the backflow assembly's pipes, the pool pad's conduit and plumbing. Ask the homeowner three questions: is the air conditioning or heat pump in use, does the generator exercise on a schedule and which day, and is the irrigation set to run during the work.
What breaks if skipped: the crew finds the generator when it starts beside the ladder.
2. Cover for overspray without sealing intake air
Do it because every one of these machines moves air through itself to stay cool, and the covering that protects its finish can make it fail.
An outdoor air conditioning or heat pump unit pulls air through its coil and blows it out the top. Wrapping it in plastic while it runs drives up its refrigerant pressure until a safety control shuts it off or the compressor overheats. If the unit must be covered for spraying, ask the homeowner to turn the system off at the thermostat for that period, cover it only while it is off and only during the spraying, and uncover it before the system goes back on. Use a drop cloth or masking paper, never sealed plastic, and leave the top open where you can.
A standby generator is never covered, because it can start at any time. Shield it with a hand-held spray shield instead, or spray that section by brush and roller.
The pool pump and heater move air too, and the heater has a flue. Mask only what overspray will reach, and leave the motor and heater vents open. Where a unit's owner's or installation manual gives covering or clearance guidance, it governs.
What breaks if skipped: a condenser that trips on high pressure every afternoon, or a generator that starts under a tarp.
3. Keep water and spray away from electrical gear and the meters
Do it because most of this equipment is weather-resistant, not pressure-washer-proof, and the meters belong to the utilities.
Aim pressure-washer and spray streams away from meters, disconnects, receptacles, the generator, and pool equipment panels. Wash near them by hand with a low-pressure hose or a brush. Do not wash an outdoor unit's coil with a pressure washer at all; it folds the thin aluminum fins and blocks the airflow it needs.
The gas meter's regulator has a small vent, usually a screened opening facing down. It must stay open: do not paint it, tape it, wash debris into it or pile mulch or soil against it. The electric and gas meters themselves are utility property; do not paint them, their glass, or their seals. Mask the wall around them and leave the meter alone.
What breaks if skipped: a tripped breaker on a wet disconnect, a blocked regulator vent, or a utility charge for a painted meter.
4. Keep mowers and string trimmers off line sets and wire
Do it because the lines run along the ground or low on the wall, and they are softer than anything a trimmer meets.
Trim by hand within about a foot of the outdoor unit, the generator, the backflow assembly and the pool pad. Look for the refrigerant line set's foam insulation, the thin control wire, low-voltage landscape lighting cable, irrigation wire and the conduit to each machine. A trimmer that strips the foam off the line set does not stop the system, but the bare suction line sweats, the insulation keeps degrading in sunlight, and a nicked copper line can leak refrigerant. Point the mower discharge away from the outdoor unit so it does not throw stones into the coil, and lift the deck over valve box lids and backflow test cocks.
5. Leave the backflow assembly and its relief port clear
Do it because an irrigation backflow assembly is the only thing keeping lawn water out of the house's drinking water, and it is tested by a certified tester, not by you.
Do not bury it in mulch, wrap it, paint its test cocks or valves, or stand on it. A reduced-pressure assembly (the type with a relief port on the bottom) must be able to dump water through that port; do not block or bury the port. If your work damages it, see the case in The Landscaper Who Cut the Line to the Backflow Assembly.
6. Report anything you hit, the same day
Do it because a damaged line reported today is a small repair, and one discovered later becomes a dispute about who caused it.
Stop, photograph it, tell the homeowner and give them the photos, and name the trade that owns it. Write it in your job record. Do not tape, patch or straighten another trade's equipment.
A worked example: a three-day exterior repaint
A painting crew is spraying the siding of a two-story house in July over three days. On the walk the crew lists five pieces of equipment plus the line set, the one line most likely to be hit. Their walk sheet reads:
OUTDOOR EQUIPMENT WALK - EXTERIOR REPAINT
EQUIP WHERE IN USE? PLAN
------------- -------------- ---------- ----------------
AC outdoor back wall, by yes, daily HO turns system
unit kitchen off 9 to 1 day 2;
paper sides, top
open, off by 1
line set and back wall into yes hand trim only,
control wire house ladder clear 2 ft
gas meter and side wall yes mask wall only,
regulator vent faces down,
leave clear
electric meter side wall yes mask wall around,
+ disconnect hand wash only
standby side yard, exercises never covered;
generator 3 ft off wall Tue 11 am hand shield; no
spray near Tue
backflow front bed, irrigation HO sets to off
assembly by hose bib runs 6 am days 1 to 3; no
mulch on port
Day 1, washing. The washer works the siding at a wide tip and stays at least 3 ft from the meter wall, finishing that section with a brush and a garden hose. The outdoor unit is not washed. The backflow assembly is left uncovered, and the drop cloths in the front bed are kept off it and its relief port.
Day 2, spraying, Tuesday. The walk said the generator exercises Tuesday at 11. So the crew sprays the side wall by the generator on day 3, and the back wall on day 2, where the AC unit is. The homeowner turns the system off at 9. The crew papers the unit's sides with the top open, sprays the back wall, and pulls the paper by 12:45. The homeowner turns the system back on at 1 and the unit starts and runs normally.
Day 2, the hit. Moving a ladder at the back corner, a crew member breaks the 2 ft clearance on the walk sheet, sets the ladder foot on the line set and tears about 8 in of the foam insulation off the large copper line. The copper is not bent and nothing hisses. The crew stops, photographs it, and tells the homeowner the same afternoon, naming it as the refrigerant line insulation and an HVAC repair. Nobody tapes it. The homeowner's HVAC company rewraps it the following week.
Day 3, the generator side. The generator stays uncovered. The crew shields it with a hand-held board and cuts in the wall above it with brushes. Tuesday is past, but a power failure could still start it, so the crew keeps everything clear of its intake and exhaust.
Result. All five pieces of equipment protected by their own rule, one hit reported the same day with photos and the owning trade named, no covering on any machine while it could run.
What would change the call
- A heat pump in winter: in heating mode a covered outdoor coil starves for air, ices over and can trip the unit or keep it in defrost; the same off-while-covered rule applies.
- A pool pad with chemical feeders: chlorine products do not get pressure-washed near or mixed with paint solvents; keep washing water off the chemicals and their containers.
- The equipment is already damaged before you start (bent fins, torn insulation, a cracked backflow bonnet): photograph it on the walk and show the homeowner before you work, so it is on record as existing condition.
How to know you got it right
Every piece of outdoor equipment is on the walk sheet with a plan, nothing was covered while it could run, no water went into electrical gear or meters, the regulator vent and the backflow relief port are clear, and anything hit was reported the same day with photos.
References
- Equipment installation and owner's manuals for clearance and covering guidance (outdoor units, standby generators, pool heaters)
- Your gas and electric utilities' rules on meter access and tampering
- See related: Outdoor HVAC Units for Landscapers, Fence and Deck Builders
- See related: Standby Generators and Transfer Switches for Every Trade
- See related: The Pool Equipment Pad for Landscapers and Electricians