Active warming of pet birds under general anesthesia is necessary to prevent hypothermia and its associated, potentially life-threatening complications. The ability of a forced-air warming system to provide thermal support was compared to a circulating-water blanket and an infra-red heat emitter during isoflurane anesthesia of Hispaniolan Amazon parrots (Amazona ventralis). Ten Hispaniolan Amazon parrots were anesthetized once weekly for one of five 60-minute trials using different heating devices. Trial (1) no thermal support; Trial (2) surgical drape only; Trial (3) circulating water blanket and surgical drape; Trial (4) ceramic infra-red heat emitter and surgical drape; Trial (5) forced-air warmer and surgical drape. Each bird acted as its own control. The birds were mask-induced with isoflurane in oxygen, intubated and maintained on isoflurane with spontaneous ventilation. Subjects were positioned in dorsal recumbency on a cotton towel on a stainless steel surgical table. A 5.5 cm × 5.5 cm area on the ventral abdomen was plucked and surgical prepared to simulate a surgical situation. A lead II ECG was continuously monitored to determine heart rate and rhythm. A temperature probe was inserted into the thoracic esophagus and readings were taken every 5 minutes. Digital thermometers were placed around the bird to monitor the ambient temperature immediately adjacent to the bird and the surrounding area. The readings were taken every 15 minutes. Body temperature and surgical area temperature were considered to be continuous and were found to follow a normal distribution using the Shapiro Wilk Statistics, where differences were evident, selected multiple comparisons were made within treatments to baseline temperature and between treatments. Multiple comparisons were made using adjusted least squares means, controlling the experimental type 1 error and 0.05 PROC MIXED was used for the analysis (SAS V8, SAS Institute, Cary, NC, USA). None of the warming devices prevented a significant decrease in esophageal temperature over the 60 minutes. The average temperature losses for the control trial, drape-only, and heat emitter, respectively, were 3.15, 2.45, and 2.55 °C. A significant decrease from 15 minutes was observed with all warming treatments, except the forced-air warmer, which prevented a significant decrease until 30 minutes. For the last 30 minutes, there was a significant decrease in esophageal temperature for the forced-air warmer treatment (from 39.135 to 39.125 °C). However, the esophageal temperature remained within the clinically acceptable normothermic range (all temperatures remained above 38.35 °C). The forced-air warmer system proved superior to traditional heating modalities in preventing heat loss during isoflurane anesthesia in Hispaniolan Amazon parrots.