Key takeaways
- SMS wins decisively on every metric that matters: higher open rates, faster response times, and roughly double the review completion rate compared to email.
- Timing matters as much as channel: a request sent within hours of the job, while satisfaction is fresh, outperforms one sent days later regardless of channel.
- Compliance isn’t optional in 2026: SMS review requests require proper opt-in and registration, and skipping that step can get your messages blocked entirely.
Getting more Google reviews sounds like it should come down to just asking, but the channel you ask through changes your results more than most HVAC companies realize. A review request sent by email competes with a crowded inbox and gets read, if it gets read at all, hours or days after the job. A text message lands on a homeowner’s lock screen within minutes and gets read almost immediately. That difference compounds into a real gap in how many reviews you actually collect.
Still Writers builds review generation and reputation strategy for HVAC companies across the US and Canada, and channel choice is one of the simplest, highest-return changes a company can make to its review flow. We’ve watched client companies shift from a trickle of reviews to a steady stream just by changing how the request goes out, without changing anything else about the service itself. This isn’t a close call, but it does come with a few real tradeoffs worth understanding before you switch.
This article compares SMS and email for review requests, covers the compliance requirements that matter in 2026, and shows how to combine both for the best result. You’ll learn:
- How SMS and email compare on open rates, response times, and completed reviews
- What compliance requirements apply to SMS review requests now
- How to build a request sequence that uses both channels effectively
The numbers, side by side
The gap between channels is large enough that it’s worth measuring on your own account rather than taking it on faith, but independent industry comparisons consistently show the same pattern across service businesses.
| Metric | SMS | |
|---|---|---|
| Open rate | Around 98% | 20 to 30% |
| Typical response time | Minutes | Hours to days |
| Review completion rate | 12 to 20% | 3 to 8% |
| Cost per message | A few cents | Effectively free |
| Compliance requirement | TCPA opt-in, A2P 10DLC registration | CAN-SPAM opt-in |
Email isn’t free of cost either, once you account for the sheer amount of inbox competition a review request faces. The average person deals with well over a hundred emails a day, and a review request has to compete with all of them for a click that a text message gets almost automatically just by landing on a lock screen.
Why timing matters as much as channel
A review request sent while a technician is still finishing up paperwork in the driveway lands during the moment a homeowner’s satisfaction is highest. The same request sent two weeks later, after the relief of a working furnace has faded into background normalcy, gets a noticeably weaker response regardless of channel. SMS has a natural advantage here since it’s easy to automate immediately after a job closes, but the underlying principle applies to email too: send the request while the experience is still fresh, not on a delayed weekly batch schedule.
What compliance actually requires in 2026
SMS review requests aren’t a free-for-all. TCPA compliance requires proper opt-in before texting a customer, and as of 2026 most major carriers block unregistered business SMS traffic entirely under A2P 10DLC requirements, meaning a company sending review request texts without proper registration risks having messages silently dropped rather than delivered. Every message should also include a clear opt-out option. None of this is difficult to set up, but skipping it either gets your messages blocked or creates real legal exposure.
Email carries its own, lighter compliance requirement under CAN-SPAM, including a working unsubscribe link and accurate sender information. Both channels require the customer’s consent to contact them this way, which is typically gathered as part of your standard service agreement or intake process rather than a separate step.
Most review platforms and CRM tools built for home service businesses handle A2P 10DLC registration and TCPA compliance as part of their setup process, so this isn’t something most contractors need to build from scratch. Still, it’s worth confirming with any tool you’re evaluating that registration is actually complete before you start sending, since a company sending unregistered traffic often doesn’t realize messages are being blocked until response rates mysteriously drop.
How to build a sequence that uses both channels
The strongest approach for most HVAC companies isn’t choosing one channel exclusively, it’s using SMS as the primary channel with email as a light backup. A practical sequence looks like a same-day text sent shortly after job completion, followed by a single email reminder a few days later for customers who haven’t responded to the text. This captures the speed advantage of SMS while still reaching customers who may have opted into email only or missed the initial text.
- Keep the SMS short and specific: naming the technician and the work done performs better than a generic “please review us” message.
- Include a direct link to your Google review page: removing friction from the click matters as much as the message itself.
- Don’t over-message: one text and one follow-up email is usually enough. Repeated requests annoy customers and increase opt-outs.
- Automate where possible: triggering the request automatically off job completion in your scheduling software removes the risk of a busy technician forgetting to send it manually.
This same review flow does double duty as a trust signal on your website, particularly on high-stakes pages like your emergency dispatch page, where a visible, current review count helps a hesitant visitor choose your company, an issue covered in why your HVAC emergency dispatch page isn’t converting this winter. A review system worth automating also overlaps with the broader missed-call and lead-tracking tools covered in missed-call text-back tools for HVAC companies, since many of the same platforms handle both functions.
Where review requests fit into your broader marketing
Fresh, steady reviews feed directly into your Google Business Profile’s overall trust signal, which matters alongside the active posting habit covered in 5 GBP post ideas that actually get HVAC companies winter calls. A profile with recent, specific reviews paired with regular posts reads as a genuinely active, trustworthy local business, which matters most during the exact moment a homeowner is comparing several companies in an emergency search.
Why review volume and freshness both matter
A large historical review count matters less than most contractors assume if the most recent review is from eight months ago. Homeowners scanning reviews tend to look at the dates as much as the star rating, and a steady trickle of recent reviews signals an active, currently reliable business in a way a large but stale review count doesn’t. This is part of why a consistent request habit, sent shortly after every job, matters more than an occasional push to catch up on a backlog.
It also compounds over time in a way that’s easy to underestimate early on. A company sending consistent SMS requests after every job accumulates a steady stream of fresh reviews month over month, while a company relying on sporadic email blasts sees the same handful of motivated customers respond each time, with the rest of the customer base going unrepresented in the review count entirely.
SMS vs. email review requests: your next step
You came here trying to decide which channel actually gets more reviews. Here’s a quick recap of what you learned:
- SMS beats email decisively on open rate, response time, and completed reviews.
- Sending the request while satisfaction is fresh matters as much as which channel you use.
- SMS requires proper TCPA opt-in and A2P 10DLC registration in 2026, or messages risk being blocked entirely.
- The strongest approach combines SMS as the primary channel with a light email follow-up for non-responders.
Still Writers builds review generation strategy for HVAC companies across the US and Canada, and getting the channel and timing right is one of the fastest, most measurable wins a client can make. We watch this play out across dozens of companies, which gives us a clearer read on what actually converts into completed reviews than a single in-house team guessing at the right approach. If a straight, no-pressure conversation about your own review flow sounds useful, click through and talk to a marketing expert today.
Frequently asked questions about SMS vs. email review requests
Is SMS really that much better than email for review requests?
Yes, industry data consistently shows SMS outperforming email on open rate, response time, and completed reviews by a wide margin, though your own results are worth measuring directly.
Do I need special registration to send SMS review requests?
Yes. As of 2026, A2P 10DLC registration is required for business SMS traffic in the US, and unregistered messages risk being blocked by carriers entirely.
How soon after a job should I send a review request?
As soon as reasonably possible, ideally the same day. Satisfaction fades over time, and a delayed request gets a noticeably weaker response regardless of channel.
Should I stop using email for review requests entirely?
Not necessarily. A light email follow-up for customers who don’t respond to an initial text can still capture additional reviews without much added effort.
How many times should I ask a customer for a review?
Once, with a single light follow-up, is usually enough. Repeated requests tend to annoy customers and increase opt-outs rather than improve response rates.
What should you read next?
- 5 Google Business Profile post ideas that actually get HVAC companies winter calls: pair a stronger review flow with active local visibility.
- Why your HVAC emergency dispatch page isn’t converting this winter: put your review count to work as a trust signal.
- Missed-call text-back tools for HVAC companies: an honest review: see how SMS automation fits into your broader lead flow.
If you’re not ready to talk to us yet, these resources will help you learn more first.
