Retell AI vs Sera
A straight look at how these tools handle the HVAC front office: answering calls, booking jobs, following up, and keeping records. Capabilities come from each vendor’s own public materials. Reviews are real and linked to their source.
Capabilities, side by side
Each tool is scored on its own terms, by the same set of categories. Hover any cell for the definition and the source behind it.
| Capability | Retell AI | Sera |
|---|---|---|
| AI Voice (Inbound) | Partial* | No* |
| AI Voice (Outbound) | Partial* | No* |
| SMS Follow-up | Partial* | No* |
| Appointment Booking | Partial* | Partial* |
| Native CRM | No* | Yes |
| Payments | Partial* | Partial* |
| Dispatch & Scheduling | No* | Yes |
| Review Management | No* | No* |
| Live Human Backup | Partial* | No* |
| HVAC Trade Templates | No* | Partial* |
| FSM Integrations | No* | Yes |
Yes / Partial / No reflect each tool on its own terms, scored from its public materials. Hover a cell for the definition and source. * marks limited evidence.
Pricing model
Pricing changes often and each tool prices differently (per seat, per minute, per call, or usage based). Rather than freeze a number that goes stale, we link straight to each vendor’s own pricing page so you see the current model at the source.
What customers say
Verbatim public reviews, praise and complaints both, each linked to where it was posted. We do not edit or cherry-pick for tone.
Retell AI
5/5 · 93 reviews“For small businesses in 2026, CloudTalk is the strongest fit because it's the only platform in this comparison that ships AI voice agents as part of a full call center software stack.”
“Lack of ability to select server location to ensure connection speed. Lack of access to outgoing call logs”
“The instant transcripts, concise summaries, and built-in A/B testing empower our team to optimize scripts and close more deals—highly recommended for scaling outbound calling.”
“I think the SMS function is a little bit expensive”
Sera
3/5 · 23 reviews“I used to think Sera was good because it was lightweight and easy to use. I liked that it didn't hang up and it was easy to find stuff.”
“I'm frustrated with Sera because it hangs up and the tech is slow.”
“I appreciated the dispatch and calendar schedule features, and it was convenient to move between pages.”
“They haven't added any new features, and the customer support is unresponsive.”
Trade fit
The home service trades each tool is tracked for.
Retell AI
- HVAC
Sera
- HVAC
- Plumbing
- Electrical
One of these is ours. Here is the honest pitch.
ServiceAgent is the AI front office built for home service teams. It answers every call, books the job, and keeps your records straight. Try it and judge for yourself.