Joist & Kilowatt Home Energy · Ferry Mills · every job metered since 2016
We run the payback table before we run the van.
Joist & Kilowatt audits, air-seals and insulates around Ferry Mills with a spreadsheet open the whole time — CFM50 before and after, the fuel bills you photograph, and a payback table that names the season the work pays for itself. If a measure does not pay, we say so and leave it out of the scope.
The utility rebate window closes with the fiscal year — we file the paperwork, and the clock starts at the audit. (555) 081-8364 · meter@joistandkilowatt.example
Services
The metered method, in order
01
The audit — $185, credited
Blower door, infrared and the fuel bills you bring: the baseline in CFM50, the images of where the heat leaves, and the usage that turns both into money. The fee credits against any work booked within the year.
02
The table, before the scope
Every candidate measure — sealing, dense-pack, the attic, the rim, ventilation — gets a row with a cost, a saving and a payback season on it. You see the arithmetic before you see a price, because the arithmetic is the price’s excuse.
03
The work — seal, pack, blow
The lines that earned their rows, done in the order the physics wants: holes closed first, cellulose at 3.5 lb/ft³ in the walls, R-60 over the ceiling, foam on the rim. One crew, both readings printed.
04
The test-out and the ledger
The blower door returns, the second reading prints beside the first, and the following spring we ask for the fuel bills again — because the table is only honest if somebody checks it against the meter.
The Reading
$185audit, credited
- Blower door — CFM50 baseline
- Infrared set, images in your file
- Payback table for every measure
- Fee credited to any work booked
About ninety minutes, house cold.
The Retrofit
from $3,900quoted off your table
- Air sealing — every hole the images name
- Dense-pack walls at 3.5 lb/ft³
- Attic to a settled R-60
- Rim-joist foam, cellar side
- Test-out reading printed on the invoice
Every line priced only where the table says it pays.
The Watch
$140per year, after the work
- Annual blower-door re-read
- Attic hatch and damper check
- Filter and core service on vents we fitted
- First call when a bill moves
Keeps the number you paid for.
How the numbers get made
From meter to payback table
The same four moves on every scope — the bills make it honest, the audit makes it specific, the table makes it decidable, and the re-read makes it true.
The bills you bring
Twelve months of fuel bills, photographed or photocopied — the metered truth of what the house actually spends, against which every promise on this page is checked.
The audit
Blower door and infrared with the house cold: the CFM50 baseline and the images of where the heat leaves. Roughly ninety minutes, and the images stay in your file.
The table
Cost, saving and payback season for every candidate measure, built from your readings and your bills — with the measures that do not pay struck through and kept visible.
The work and the re-read
The rows that earned their place get built, and the blower door returns to close the account. Both readings print, and the spring bills confirm what the table forecast.
Ferry Mills & the Nettleby Flats, 2025 — 2026
The ledger, in houses
Six scopes from last season’s ledger, photographed at the test-out. Every caption carries the two numbers, because that is what a finished job looks like here.
The 2025 accounts, closed
The ledger, checked against the meter
Figures off last season’s closed accounts — scopes in, work done, bills returned. The struck-through measures are counted too, because a table that only remembers its wins is a brochure.
They showed me a table before they showed me a price: sealing paid in two winters, walls in four, and the window replacement another firm had quoted eleven thousand for did not pay inside twenty years — so they struck it through and left it out. The work they did do dropped the gas bill thirty-one percent, and the re-test beat the number on the scope. I have never been talked out of a purchase so gratefully.
The struck-through lines are what sold me. Any firm can show you what to buy; this one showed me what NOT to buy, with arithmetic, and then charged exactly what the table said. The Watch re-reads the house every autumn and the number has held for three years.
Our 1908 terrace tested 4,300 CFM50 and the table said seal-and-walls first, attic second season. They did exactly that, in that order, and the spring bills landed within two points of the forecast. My accountant husband framed the table. He has never framed anything.
The audit was free — 1936 house, pre-1940 rule — and nobody tried to make it back on the scope. Sealing only, by the table’s advice, and the kitchen stopped being the cold room for less than a thousand. Next winter the walls go in, exactly when the table said they should.
The five the meter desk gets
Ledger questions
If yours is not here, the desk line runs seven to five and answers with arithmetic rather than adjectives.
Why show me measures that do not pay?
Because the table only means something if it can say no. A firm whose every recommendation clears its own bar is not measuring — it is selling. The struck-through lines cost us work every week and earn us the work that matters: the ones the meter checks.
How do you calculate the payback season?
Your CFM50 baseline and infrared findings give the saving per measure; your twelve months of fuel bills give the price of the heat being lost; current utility rates and the rebates you qualify for set the rest. The arithmetic fits one page, and the page goes home with you whether you book or not.
What if fuel prices fall?
The payback stretches, and we show the table at two prices so you can see how much. The physics does not change — the holes are still holes — but the honest answer is that cheap fuel delays the refund, and we would rather you knew by how much.
Is the pre-1940 free audit a loss leader?
It is a bet the meter usually wins: older houses have the biggest, most photographable leaks, and the table that follows tends to be short and convincing. If yours comes back with nothing worth doing, the reading cost you nothing and we will say so in writing.
What does the Watch actually watch?
The number. An annual blower-door re-read to confirm the envelope is holding, the hatch and dampers checked, filters and cores serviced on ventilation we fitted, and the first look when a fuel bill moves without the weather to explain it. It is the maintenance schedule a measurement deserves.
The meter desk runs seven to five, Mills-wide — and pre-1940 houses read free all year · (555) 081-8364 · meter@joistandkilowatt.example
Get your table
Bring the town, the decade the house was built, and a year of fuel bills if you can lay hands on them. The reading is $185 — free on pre-1940 houses — and the table it produces is yours to act on with anyone, including nobody. meter@joistandkilowatt.example