Talking about savings without guaranteeing them, in writing

Aug 29
3 min read

Updated: 3 days ago

Introduction

The written quotation is careful. It gives an estimated range, states the assumptions and calls it an estimate. The conversation in the customer's kitchen was different: a confident figure, a promise that bills would halve, and a comparison with the neighbour's system.

The customer remembers the conversation. When the first year does not match, they hold the business to what was said rather than to what was written, and in many jurisdictions they have grounds to. The gap between careful documents and confident conversations is where most of this risk lives. It is also the gap that no amount of small print in the quotation will close.

1. Talking about savings without guaranteeing them means separating estimate from promise

The distinction that matters legally and practically.

An estimate with visible assumptions is a projection. A figure stated confidently, without qualification, is heard as a commitment regardless of what any document says afterwards.

2. Know what your jurisdiction regulates

Not a matter of style.

Consumer protection rules, advertising standards and certification scheme requirements all govern claims about financial benefit, and some are strict. Establish what applies to you before designing any sales material or training anybody.

3. Always state the assumptions

The habit that makes a figure defensible.

Usage, occupancy, tariff, system performance and weather. Attaching these to every figure, verbally as well as in writing, is what turns a claim into a projection and what protects you two years later. The verbal half is the one that gets forgotten and the one that causes the dispute.

4. Use ranges rather than points

More honest and better received.

A band with the conditions producing each end conveys more information than a single number and commits you to less. Customers generally find it more credible, because a precise figure about an uncertain future invites scepticism. A range also survives the first difficult year in a way that a single number does not.

5. Say plainly what you do not control

Removes the basis for a later complaint.

Energy prices, how the customer uses the system, occupancy changes, and future policy. Naming these explicitly is not undermining your own case; it is describing the situation accurately.

6. Never compare with an unrelated property

A frequent and unreliable shortcut.

The neighbour's system on a differently oriented roof with a different household tells the customer nothing useful, and it creates an expectation you cannot meet. Comparisons must be like for like or not made at all.

7. Train the people having the conversations

Where the exposure actually is.

Salespeople paid on commission, engineers being friendly, and anybody answering the telephone. Most overpromising is verbal, unrecorded and made by somebody who has never read the compliance guidance.

8. Put anything discussed into the documentation

Close the gap between the two.

If a figure was mentioned in conversation, it should appear in writing with its assumptions. That converts a remembered promise into a documented estimate and it is the single most effective protection available.

9. Keep a record of what was presented

Disputes are decided on evidence.

The version of the estimate given, the assumptions in it, and the date. Where a customer later alleges a guarantee, being able to produce what was actually provided resolves it quickly.

Be aware that the careful approach also sells better in this market. Customers have encountered installers making implausible claims, and an installer who explains the uncertainty honestly is frequently the one they trust, which means compliance and conversion point in the same direction.

Conclusion

Separate estimates from promises, particularly in conversation where most of the risk arises.

Establish what your jurisdiction and certification scheme require, state the assumptions behind every figure verbally as well as in writing, use ranges rather than single numbers, name explicitly what you do not control, avoid comparisons with properties that are not genuinely alike, train everybody who speaks to customers, put any figure discussed into the documentation, keep a record of what was presented, and recognise that honest caution converts well in this market.