The key contributor to Mr Joyce's death was a faulty refrigerator which, when tested, gave off abnormally high levels of carbon monoxide.
It was determined that this was likely due to a lack of maintenance rather than a design fault.
A portable LPG heater and a gas cooker may also have contributed to the levels of carbon monoxide in the confined space, Coroner McElrea said.
He made a recommendation to the Ministry of Business, Innovation and Employment's Energy Safety team that it reviews the safety messages on its website, with particular reference to the regular maintenance of gas appliances in confined spaces like caravans.
He said there were clear safety messages arising from Mr Joyce's death relating to the need for proper ventilation, the importance of regular maintenance of equipment such as refrigerators and cookers, and the desirability of installing carbon monoxide sensors.