Smart Thermostat Installation Break-Even Analysis: 72 Jobs/Month

Fixed costs $2.5K Monthly overhead

Contribution margin 72% After variable costs

Break-even revenue $23.9K Monthly target

Break-even timing Month 10 Launch ramp

Break-even calculator

Use this to test monthly revenue, variable expenses, and fixed costs against break-even for a smart thermostat installation service.

Lean Base Full

Monthly revenue Sales from installs and related service work. $ Lower sales Higher sales Variable expenses Parts, subcontract labor, fuel, and card fees that move with jobs. $ Lower costs Higher costs

Money available to cover fixed costs $32,940 $45,000 revenue - $12,060 variable expenses

Margin ratio

73%

Covers fixed costs

Yes

Fixed monthly costs Rent, software, insurance, payroll, and other monthly overhead. $ Lean overhead Heavier overhead

Break-even chart Revenue Total costs

Which expenses are fixed, and which move with smart thermostat installation sales?

Cost classification

Break-even is reliable only when fixed bills stay separate from job-linked expenses. Here, Month 10 break-even depends on treating rent and software as monthly overhead, while parts, subcontract labor, fuel, and card fees move with revenue.

Expense	Cost	Break-Even Treatment	Common Mistake
Small Storage Facility Rent	Fixed	Include $1,200 per month from Month 1 through Month 60.	Treating rent as job-linked when it stays due even in slow months.
Business Liability Insurance	Fixed	Include $350 per month as baseline overhead.	Dropping insurance from break-even because it is not tied to installations.
CRM and Scheduling Software	Fixed	Include $250 per month as operating overhead.	Modeling software as variable before any usage-based pricing is shown.
Accounting and Tax Prep	Fixed	Include $400 per month in fixed overhead.	Only booking this during tax season and understating monthly break-even.
Annual Marketing Budget	Semi-fixed	Convert the first-year $15,000 budget to about $1,250 per month, then step it up by year.	Using CAC only and forgetting the committed annual spend.
Inventory and Installation Parts	Variable	Use 12% of first-year revenue, falling to 10% by the fifth year.	Treating the $10,000 initial inventory stock as a recurring monthly expense.
Subcontracted Specialist Labor	Variable	Use 8% of first-year revenue, falling to 6% by the fifth year.	Putting specialist help in fixed payroll when it scales with job mix.
Vehicle Fuel and Maintenance	Variable	Use 5% of first-year revenue, falling to 4.2% by the fifth year.	Ignoring route density and making fuel a flat monthly amount.

How does break-even shift between a lean, base, and full operating setup for a smart thermostat installation service?

Scenario table

Break-even moves fast as revenue density rises: the lean case stays underwater, the base case sits near the line, and the full case builds a real cushion. Contribution margin is the share left after variable costs.

Planning assumptions only; actual break-even will move with booking mix, routing, and staffing discipline.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean install-only case	$135k	$38k	$154k	72%	-$57k	Still below break-even; fixed overhead is too heavy.
Base routed service case	$215k	$60k	$155k	72%	$0	At the line; a small drop can turn profit negative.
Full Year 2 operating case	$450k	$121k	$216k	73%	$113k	Healthy cushion; scale works if staffing stays tight.

What breaks the break-even plan if bookings slow or costs rise?

Stress test

The base plan only clears break-even by about $11k on first-year revenue, so weak booking pace is the first risk. Higher parts, fuel, or fee costs can erase that cushion fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$213k	$11k cushion	Small cushion if bookings stay on pace.
Revenue shortfall	Revenue falls 15% from the base plan.	$213k	$23k gap	A modest sales miss wipes out the cushion.
Fixed-cost increase	Overhead rises 10% from the base plan.	$235k	$11k gap	Payroll or rent growth pushes break-even out.
Margin pressure	Variable expenses rise from 28% to 33%.	$229k	$5k gap	Higher parts, fuel, or fees cut the margin.
Combined pressure	Revenue falls 15% and overhead rises 10%.	$252k	$28k gap	Weak demand plus cost creep turns break-even into a stretch.

Is this smart thermostat installation service ready to add overhead before break-even?

Founder checklist

Don’t add another tech, vehicle, or storage unit until booked demand, margin, and cash all line up with Month 10 break-even. The model turns positive later, but the Month 2 cash trough makes extra overhead a real risk.

1Demand Proof$299/job

Verify booked installs are landing near the $299 average job value before hiring another technician, since the $120 CAC only works if the mix stays strong.

2Fixed Load$2.45K/mo

Hold storage and other fixed overhead at $2,450 a month until bookings cover the base load, or the break-even target moves farther out.

3Margin Mix72% CM

Price standard installs, multi-zone packages, and annual optimization separately so the 72% contribution margin before wages does not get buried by parts, labor, fuel, and card fees.

4Tech RampMonth 13

Do not pull forward the Month 13 junior tech or a second van unless booked hours stay full and each zip stays dense, or labor and drive time will outrun revenue.

5Cash Cushion$798K

Keep enough cash to absorb the $798K low point in Month 2, because the model does not reach break-even until Month 10 and early losses are steep.

6Launch Stack$120 CAC

Do not scale paid ads until the booking engine, thermostat compatibility workflow, supplier accounts, and callback rules are live, because the $120 CAC only works if leads turn into booked installs.