Built for UK HVAC engineers
The HVAC engineer app for invoices, estimates & jobs
Air-conditioning installs, heat-pump commissioning and service contracts — log every site visit, F-Gas certificate and invoice in one place. Send invoices from the van, take card payments online and file tax direct to HMRC — without juggling spreadsheets.
No credit card required
Invoice
INV-0042
Bridge Street Offices
Everything HVAC engineers need to run the business
fixdd brings invoicing, estimates, jobs, customers and tax into one app — built around the way UK HVAC engineers actually work.
Estimates for HVAC engineers
Polished quotes clients accept online with deposits and stages.
Learn more →Job Management for HVAC engineers
Track every job from first quote through to final payment.
Learn more →Making Tax Digital for HVAC engineers
File VAT and Income Tax direct to HMRC under MTD.
Learn more →Invoice on the job — no laptop required
Turn a finished HVAC engineer job into a professional invoice in under a minute. Save labour rates, reuse common line items and send by email or WhatsApp before you've packed up.
- Online card payments built in
- Email open and read tracking
- Send via WhatsApp and other apps
- Mark as paid manually or automatically
Invoice INV-0089 paid
Bridge Street Offices paid £3,850.00 via card
Invoice INV-0090 viewed
Customer opened your invoice 2 min ago
Invoice INV-0085 overdue
Tap to send a payment reminder
Win more work with polished HVAC engineer quotes
Send estimates clients can accept online with a single tap. Take deposits when they say yes, split bigger jobs into stages, and convert accepted quotes to invoices in two taps.
- Online acceptance with e-signature
- Deposit and staged payments
- Convert accepted quotes to invoices instantly
- Beautiful PDF downloads
Estimate
EST-0023
Making Tax Digital — built in for HVAC engineers
Submit VAT returns and Income Tax self-assessment straight to HMRC from the same app you invoice with. No spreadsheets, no separate software.
50k+
Invoices created
£100M+
Invoices processed
12,000+
Estimates sent
98%
Would recommend
Loved by UK HVAC engineers
I used to spend Sunday evenings doing invoices. Now I send them from the van before I've even left the job. fixdd has been a game-changer for me as a HVAC engineer.
Clients love the online quotes — they just tap accept and pay the deposit. I've won more work since switching to fixdd than I did all last year.
Ready to run your HVAC engineer business the easy way?
Join thousands of UK HVAC engineers using fixdd to invoice, quote and get paid. Free to start, no credit card required.
Get started freeNo credit card required