Daft.ie-TCD Energy Cost Labeling Trial
Last registered on November 27, 2019

Pre-Trial

Trial Information
General Information
Title
Daft.ie-TCD Energy Cost Labeling Trial
RCT ID
AEARCTR-0005072
Initial registration date
November 27, 2019
Last updated
November 27, 2019 10:52 AM EST
Location(s)
Region
Primary Investigator
Affiliation
Trinity College Dublin
Other Primary Investigator(s)
PI Affiliation
Trinity College Dublin
PI Affiliation
Trinity College Dublin
Additional Trial Information
Status
Completed
Start date
2017-01-01
End date
2019-03-01
Secondary IDs
Horizon 2020 723741
Abstract
Property advertisements were supplemented with a new property-specific energy cost (annual) label using details from the property’s Building Energy Rating (kWh and size) and a common energy price. This label was randomly assigned to half the counties in Ireland (with one exception: we impose Dublin and surrounding counties to the treatment group). The analysis period started in January 2017 and the new labels were applied between March 2018 and March 2019
External Link(s)
Registration Citation
Citation
Carroll, James, Eleanor Denny and Ronan Lyons. 2019. "Daft.ie-TCD Energy Cost Labeling Trial ." AEA RCT Registry. November 27. https://doi.org/10.1257/rct.5072-1.0.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
We added one year energy cost forecast labels to property advertisements on Ireland's largest property sales/rental advertising website - daft.ie. This label was created using the property's energy efficiency level (kWh), size and energy price. Information was displayed on an EU-style energy efficiency label and was property-specific (each property energy cost was compared to similarly sized properties).
Intervention Start Date
2018-03-01
Intervention End Date
2019-03-01
Primary Outcomes
Primary Outcomes (end points)
1. Final property sales price
2. Time-to-sell
Primary Outcomes (explanation)
Final sales price was sourced from an external website - The Irish Property Price Register
Time-to-sell is the days between advertisement date and closing date
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The energy cost label was randomly assigned to half the counties in Ireland, with one exception - we imposed Dublin and surrounding counties to the treatment group.
Experimental Design Details
NR
Randomization Method
Randomization using Microsoft excel
Randomization Unit
County
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
26 counties in Ireland
Sample size: planned number of observations
85,287 property advertisements
Sample size (or number of clusters) by treatment arms
Treatment - 53,065
Control - 32,222
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Trial was conducted nationally for one year across all areas and properties - power calculation not needed
Supporting Documents and Materials
Documents
Document Name
Trial description (extended)
Document Type
other
Document Description
NR
File
Trial description (extended)

MD5: 4c8cb445a22ed5a6284631370b3c1cdb

SHA1: ff84ae928333e637c8a05d6bf4b9583250147737

Uploaded At: November 21, 2019

IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Trinity College Dublin Research Ethics Committee
IRB Approval Date
2017-01-01
IRB Approval Number
20170124
Analysis Plan
Analysis Plan Documents
Estimation strategy.docx

MD5: b451cd723555422e4cd94c035ad1b1a0

SHA1: aab63f141095b7906f73108e602adde662c91320

Uploaded At: November 27, 2019

Post-Trial
Post Trial Information
Study Withdrawal

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Intervention
Is the intervention completed?
Yes
Intervention Completion Date
March 01, 2019, 12:00 AM +00:00
Is data collection complete?
Yes
Data Collection Completion Date
March 01, 2019, 12:00 AM +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
26 counties of Ireland
Was attrition correlated with treatment status?
No
Final Sample Size: Total Number of Observations
85,287 properties/advertisements
Final Sample Size (or Number of Clusters) by Treatment Arms
Control - 32,222 Treatment - 53,065
Data Publication
Data Publication
Is public data available?
No

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Program Files
Program Files
Yes
Program Files URL
Reports and Papers
Preliminary Reports
Abstract
The online property field trial in Ireland explores how adding annual energy cost forecasts (based on the
property’s energy rating, size, and energy prices) to property advertisements influences sales prices and rents.
For the final sales price (final prices in Ireland are the result of a bidding process), results show a significant
increase in the efficiency sales premium in the treatment group – €2,608 for each categorical increase in
property energy efficiency (fifteen-category scale).1 For advertised sales prices and rents, we do not observe a
significant treatment effect. The results suggest that long-run energy cost labelling for property sales increases
the demand for more EE properties.
Completion Date
February 05, 2019 12:00 AM +00:00
Url
https://storage.googleapis.com/wzukusers/user-26722815/documents/5c616bc6a6637aNO8VCA/D4.1%20Field%20trials%20UPDATED%20FINAL.pdf
Relevant Papers