Every home accumulates institutional knowledge that lives only in the heads of the people who live there: which circuit breaker controls the kitchen outlets, how to jiggle the upstairs toilet handle to make it stop running, where the water shutoff is, what the neighbor's Wi-Fi password was when yours went down. This knowledge is never documented, is constantly growing, and is catastrophically lost whenever someone new moves in or a house sitter arrives.
Michael Tiffany
Every home has a manual that nobody wrote. The previous owners knew that the hot water takes ninety seconds to reach the upstairs bathroom, that the garage door opener only works if you hold the button for a full three seconds, and that the circuit breaker labeled "bedroom 2" actually controls half the kitchen outlets. They knew these things because they discovered them by accident, cursed about them, adapted, and eventually stopped noticing. Then they moved out and took all of that knowledge with them, and you spent your first year rediscovering it from scratch.
This is what institutional knowledge looks like in a domestic setting, and it's remarkably similar to what happens in organizations: critical operational details live in people's heads rather than in any system, and when those people leave, the knowledge leaves with them. Home inspectors consistently report that "90 percent of the problems we see are the result of deferred or ignored maintenance," and a significant portion of that deferred maintenance happens because the homeowner simply forgot what needed doing, (or never knew in the first place). Your home has never had an institutional memory and the result is that every homeowner, every house sitter, and every new tenant starts from zero. Building that memory is straightforward, but it requires you to articulate things you've known so long you've stopped noticing them.
The fastest way to seed your agent with home knowledge is to walk through your house, room by room, and narrate what a competent house sitter would need to know, framing it not as a real estate listing ("spacious kitchen with granite countertops") but as an operator's manual ("the dishwasher runs hot on the normal cycle so use the light cycle for anything with plastic, the garbage disposal jams if you put celery in it, and the water filter under the sink needs replacing every six months; I last replaced it in January").
Pick a room, open your phone, start recording, and talk for two or three minutes. Cover what works well, what's quirky, what's broken, what's been repaired recently, and what a stranger would get wrong. Then move to the next room.
Example:
"Starting with the kitchen. The stove is gas; the igniter on the back left burner doesn't click anymore, so you need to light it with a match. The oven runs about 25 degrees hot, so if a recipe says 350 you set it to 325. The fridge water filter is a Samsung DA29-00020B; I order it from Amazon and it lasts about six months. The cabinet above the stove has a lazy Susan that jams if you overload the right side. The fire extinguisher is under the sink, behind the cleaning supplies."
That single memo gives your agent: an appliance issue to track (broken igniter), a calibration fact (oven runs hot), a consumable with a specific part number and replacement cadence (water filter), a quirk (lazy Susan loading), and a safety item location (fire extinguisher). None of this is documented anywhere else, and all of it would be useful to you in six months when you've forgotten the filter model number, to a house sitter next summer, or to a buyer if you ever sell.
Beyond room-level details, your home has systems that cross rooms and require their own documentation: HVAC, plumbing, electrical, and networking. These are the areas where forgotten maintenance causes the most expensive problems, and they're also the areas where homeowners most often lose track of what was done, when, and by whom.
Tell your agent about each system in terms of what it is, where its controls are, what maintenance it needs, and what's been done recently.
"The furnace is a Carrier Infinity in the basement utility closet. The filter is a 20x25x4 MERV 11; I change it every three months and I last changed it in October. The thermostat is a Nest on the first floor hallway. The condensation line has backed up twice in the past three years, and both times I cleared it with a wet-dry vac on the PVC cleanout near the furnace. The system was last serviced by [HVAC company name] in September; their number is on the sticker on the unit."
Here is what the plumbing version sounds like:
"The main water shutoff is in the basement behind the water heater, hard to reach, requires a quarter turn clockwise. The water heater is a 50-gallon Rheem, installed in 2019, and I've never drained it. The upstairs toilet runs intermittently; the flapper valve needs replacing but I've been jiggling the handle instead. The outdoor spigots need to be shut off from inside before the first freeze; the shutoff valves are in the basement ceiling, one near the laundry and one behind the furnace."
Your agent now holds a record that would take you an hour to reconstruct from memory, and that you would almost certainly fail to reconstruct completely. When the plumber arrives and asks where the shutoff is, you can ask your agent instead of crawling around the basement. When winter approaches, your agent can remind you to shut off the outdoor spigots, because it knows the location of the valves and the timing of the task.
The walkthrough gives your agent a snapshot, and the event log keeps it current. Whenever something happens to your home, tell your agent: repairs, breakdowns, service visits, seasonal maintenance, improvements, and purchases of durable goods.
"The roofer came today, Tuesday March 4th. Replaced twelve shingles on the north side where the wind damage was, and it cost $450, paid by check. He said the rest of the roof looks good for another five to seven years but recommended replacing the flashing around the chimney before next winter. His name is Dave from [company], phone number is on the invoice I photographed."
"Noticed water staining on the ceiling in the upstairs hallway, directly below the attic access panel. There's no active dripping, but it might be related to the ice dam last month. I need to get someone up there to check before it gets worse."
"Changed the HVAC filter today, January 15th. I used the last one from the pack I bought in October, so I need to reorder."
Each of these entries is small, takes thirty seconds, and would be unremarkable in isolation. But accumulated over months and years, they compose a maintenance history that is genuinely valuable: a timeline of what's been done, what's been deferred, what's due soon, and what patterns are emerging ("the upstairs toilet has been mentioned four times in six months; it's time to actually fix the flapper valve instead of jiggling the handle").
Once your agent holds the walkthrough, the systems inventory, and the event log, it becomes useful in ways that a static document never could.
It can generate a house sitter guide with current, accurate information about every room, every system, and every quirk, tailored to the specific person and the specific dates they'll be staying. It can maintain a seasonal maintenance calendar based on the systems you've described and the cadences you've specified, reminding you to drain the water heater in spring, shut off the outdoor spigots in fall, and change the HVAC filter every three months. It can prepare a briefing for any service provider who visits: "The plumber is coming Thursday; here's the location of the shutoff, the history of the toilet issue, and the water staining we noticed in January that hasn't been investigated yet." It can track consumables and replacement parts by model number and cadence, reminding you to reorder the Samsung DA29-00020B filter in June.
The value compounds the same way the meeting briefs compound: each new piece of information makes the existing record more useful, and the record becomes the single source of truth for your home's operational state that no other system currently provides.
How long does the initial walkthrough take? The initial walkthrough takes about twenty to thirty minutes for a typical house, spending two to three minutes per room plus five minutes for each major system. You can do it all in one session or spread it across a few days. The event log takes thirty seconds per entry and only happens when something changes.
Should I include appliance model numbers and serial numbers? Model numbers are immediately useful for ordering replacement parts and filters; include them wherever you can. Serial numbers are useful for warranty claims and insurance. If you're willing to invest an extra fifteen minutes, photograph the data plates on your major appliances (HVAC, water heater, dishwasher, washer, dryer) and give those to your agent as well.
What if I rent instead of own? The walkthrough is just as useful for renters, because the quirks and institutional knowledge are the same regardless of ownership. The main difference is that your event log should distinguish between issues that are your responsibility and issues that are your landlord's, and your agent can help you track what you've reported, when you reported it, and whether it was addressed.
How does this connect to the service providers article later in the series? The home article gives your agent the physical context; the service providers article gives it the relationship context. Together, they enable your agent to match the right provider to the right problem, brief them before they arrive, and track whether their work held up over time.
Can I share my home's record with a partner or housemate? This depends on your AI tool's sharing capabilities, but the underlying record is just text. You can export your agent's home knowledge into a shared document, or both household members can debrief into the same agent. The important thing is that the knowledge lives somewhere other than one person's head.
Walk into your kitchen, start a voice memo, and talk for two minutes about what a stranger would need to know to use it competently. Cover the appliances, the quirks, and the one thing that always catches guests off guard. Transcribe it and give it to your agent. You've just created the first page of an operator's manual that your home has needed since the day you moved in.
