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What we install
One crew for the envelope, the mechanicals and the array, so the numbers actually add up.
Rooftop solar6 to 12 kW DC arrays sized from your last 12 months of kWh.
Home battery storage13.5 kWh usable, 5 kW continuous, wired to a protected loads panel.
Whole-home energy auditBlower door, thermal scan and a Manual J load, in one visit.
Heat pumpsCold-climate units rated at 5 degrees F, not at 47.
EV charger installLevel 2 at 48 A continuous, with a real panel load calculation.Work out your own numbers
Every tool here runs in your browser on figures you can change. Nothing is emailed to us.
Shading and inverter choiceWatch one shaded module drag a whole string, then switch topology.
Tilt and orientation yieldAzimuth by pitch, as a percentage of the Boulder optimum.
Time-of-use and batteriesShift kWh out of the 3 to 7 pm peak and price the difference.
EV charger load checkNEC 220.83 load calc and the 120 percent busbar rule.
Savings calculatorBill to array size to first-year production, step by step.The people doing the work
Eleven people, one warehouse on Pearl Parkway, and a service radius we can drive in under an hour.
About GreenLeafWhy we stopped selling panels on their own in 2019.
ProjectsSix homes, with the measured kWh a year after commissioning.
Reviews4.8 from 236 reviews across Google and EnergySage (sample).
Field notesWhat we learned on roofs in Boulder, Longmont and Niwot.
CareersThree open roles, pay ranges published (sample).Martin Acres, Boulder, 2025
The homeowners asked for 11 kW. The blower door said 12.6 ACH50. We sealed and insulated first, then installed 6.8 kW and beat their original target bill.
Martin Acres, BoulderHow it went
An 11 kW array, based on an online estimate that had sized the system from roof area rather than from consumption. The house used 9,900 kWh and 720 therms in the preceding twelve months, so the array would have exported a third of its output at a lower credit value while the house carried on leaking heat.
12.6 air changes per hour at 50 pascals. Thermal imaging showed the usual 1950s picture: open top plates above the interior partitions, eleven uncapped can lights, an uninsulated attic hatch and a rim joist that was essentially open to the outdoors along the north wall.
Two days of air sealing, then blown cellulose to R-60 and two inches of closed-cell foam at the rim. Retest came in at 5.1 ACH50. Only then did we design the array, at 6.8 kW DC, which covered 92 percent of the reduced consumption.
The envelope work cost $4,900 and the smaller array saved roughly $11,600 against the original proposal. Measured first-year production was 9,640 kWh against a model of 9,440, and gas use dropped 31 percent (all sample figures).
They talked us out of half the system we went in asking for, and our bills are lower than the bigger one was supposed to deliver. That is not a sales pitch you hear often.
9,640 kWh in year one against a modelled 9,440 kWh. Variance plus 2.1 percent.
Three to four hours on site, a written report in five business days, and a recommendation that might well be to spend less than you planned.
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