HVAC Estimated Taxes: Seasonal Demand Cycles and Quarterly Payments

By Yarik Yarosh, CPA ·September 5, 2026 ·5 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

HVAC has a unique dual-peak seasonal pattern that sets it apart from most trades. Instead of one busy season and one slow season, HVAC has TWO busy periods (summer cooling and winter heating) separated by TWO shoulder seasons (spring and fall) when demand drops. This creates a W-shaped revenue curve. The peaks are driven by emergency calls (AC breaks on the hottest day of summer, furnace fails on the coldest night of winter) and by installation demand (replacement systems before summer/winter). Maintenance agreements provide a stabilizing floor of revenue year-round, and this predictable income makes estimated tax planning easier than for trades with a single peak. The dual-peak pattern also means the annualized income installment method provides less cash flow benefit than for single-peak businesses because no quarter is truly dead.

✓Key takeaway

HVAC seasonal revenue pattern:

Month	Revenue	Driver
January	$18,000	Heating repairs, furnace replacements
February	$15,000	Late winter heating calls
March	$10,000	Shoulder: maintenance agreements
April	$12,000	Pre-summer AC tune-ups
May	$15,000	Early cooling season
June	$22,000	Peak AC demand begins
July	$25,000	Peak AC (emergency repairs)
August	$20,000	Late summer cooling
September	$12,000	Shoulder: maintenance agreements
October	$10,000	Pre-winter furnace tune-ups
November	$15,000	Early heating season
December	$20,000	Peak heating demand
Total	$194,000

Peak-to-trough ratio: 2.5x (July $25,000 vs. March $10,000) This is one of the mildest seasonal ratios in the trades because of the dual-peak.

Maintenance agreements as a stabilizer: 150 agreements at $200/year = $30,000 in predictable revenue. Spring visits (April-May): 75 agreements serviced Fall visits (September-October): 75 agreements serviced This fills the shoulder seasons when emergency calls are low.

Set-aside: 20-25% of net profit

On a $400 service call with $100 in parts: net $300, set aside $60-$75
On a $10,000 installation with $5,000 in equipment: net $2,000-$3,000, set aside $400-$750

How should an HVAC business plan estimated taxes?

Hypothetical example

Round numbers. A solo HVAC service tech. Year 2. Single filer. $180,000 revenue, $48,000 expenses, $132,000 net profit.

Quarterly income:

Quarter	Revenue	Expenses	Net Profit
Q1 (Jan-Mar)	$43,000	$14,000	$29,000
Q2 (Apr-Jun)	$49,000	$13,000	$36,000
Q3 (Jul-Sep)	$57,000	$14,000	$43,000
Q4 (Oct-Dec)	$45,000	$13,000	$32,000

Notice: no quarter is below $29,000 in net profit. The dual-peak pattern means there’s no truly dead quarter (unlike landscaping Q1 or snow removal Q2/Q3).

Full-year tax: $31,000

Equal quarterly payments: $7,750/quarter This works reasonably well for HVAC because income is distributed across all four quarters. The minimum quarterly net ($29,000) comfortably covers the $7,750 payment.

Annualized method:

Q1: $29,000 x 4 = $116,000. Tax ~$26,500. Payment = $6,625.
Q2: $65,000 x 2 = $130,000. Tax ~$31,000. Payment = $15,500 - $6,625 = $8,875.
Q3: $108,000 x 4/3 = $144,000. Tax ~$35,000. Payment = $26,250 - $15,500 = $10,750.
Q4: $31,000 - $26,250 = $4,750.

Quarter	Equal	Annualized
Q1	$7,750	$6,625
Q2	$7,750	$8,875
Q3	$7,750	$10,750
Q4	$7,750	$4,750

The annualized method saves $1,125 in Q1 and $3,000 in Q4, but requires $4,125 more in Q2/Q3. For HVAC, the equal quarterly method is often simpler and nearly as efficient because the income distribution is relatively even. The annualized method is worth it only if the seasonal swing is more pronounced (northern markets with sharper winter/summer peaks).

Heat wave or cold snap spike: An extreme weather event can spike revenue dramatically:

2-week heat wave in July: +$15,000-$25,000 in emergency AC calls
Polar vortex in January: +$10,000-$20,000 in emergency furnace calls

If a July heat wave adds $20,000 in revenue at 60% margin ($12,000 net):

Additional tax: $12,000 x 25% = $3,000
This needs to be covered by Q3 estimated payment
Adjust Q3 payment upward by $3,000

The installation decision and tax timing: A customer signs a $12,000 AC installation contract in June. You order the equipment ($5,000), install it in July. The customer pays:

$6,000 deposit in June
$6,000 at completion in July

When is the income recognized?

Cash basis (most sole props and S-Corps): $6,000 in Q2, $6,000 in Q3
The $5,000 equipment cost is incurred in Q3 (when you pay the supplier)

This creates a timing mismatch: $6,000 revenue in Q2 with $0 expense (deposit received, equipment not yet purchased). In Q3: $6,000 revenue with $5,000 expense plus labor. The net: Q2 shows $6,000 profit, Q3 shows $1,000 profit. Total across both: $7,000 (same as if everything happened at once).

Per-call set-aside:

Call Type	Revenue	Parts/Equipment	Net	23% Set-Aside
Diagnostic only	$89	$0	$89	$20
Capacitor replacement	$250	$30	$220	$51
Blower motor replacement	$500	$150	$350	$81
Compressor replacement	$2,500	$800	$1,700	$391
Full AC installation	$8,000	$3,500	$4,500	$1,035
Maintenance visit	$100	$15	$85	$20

Simple rule: set aside 23% of net revenue (after parts cost) for each call. For a service tech averaging 4 calls/day at $300 average with $50 average parts: daily net = $1,000, daily set-aside = $230. Over 250 working days: $57,500 set aside (vs. $31,000 actual tax). The excess comes from the simplified calculation (which doesn’t account for QBI deduction and other adjustments), but over-saving for taxes is always better than under-saving.

Illustrative numbers only, not a real client and not advice for your facts.

Related guides:

Estimated Tax Payments for HVAC Installation Businesses
Estimated Tax Payments for Roofing Contractors
Estimated Tax Payments for Painting Contractors

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Cite this page

Yarik Yarosh, CPA. "HVAC Estimated Taxes: Seasonal Demand Cycles and Quarterly Payments." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/hvac-contractor-estimated-taxes

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.