diff --git a/src/openflow/inputs/co2.inko b/src/openflow/inputs/co2.inko
index 03eb861..df9447c 100644
--- a/src/openflow/inputs/co2.inko
+++ b/src/openflow/inputs/co2.inko
@@ -13,7 +13,7 @@ let SAMPLE_INTERVAL = 30
 
 # The interval (in seconds) at which to calculate a new CO2 value based on the
 # gathered samples.
-let UPDATE_INTERVAL = 600
+let UPDATE_INTERVAL = 900
 
 # How many samples we should gather before updating the CO2 levels.
 let pub SAMPLES = UPDATE_INTERVAL / SAMPLE_INTERVAL
diff --git a/test/openflow/inputs/test_co2.inko b/test/openflow/inputs/test_co2.inko
index 8556a12..fbc09ef 100644
--- a/test/openflow/inputs/test_co2.inko
+++ b/test/openflow/inputs/test_co2.inko
@@ -122,9 +122,11 @@ fn pub tests(t: mut Tests) {
     let samples = recover [
       875, 875, 875, 875, 875, 875, 875, 875, 875, 875,
       875, 875, 875, 875, 875, 875, 875, 875, 875, 875,
+      875, 875, 875, 875, 875, 875, 875, 875, 875, 875,
 
       900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
       900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
+      900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
     ]
     let input = input(state, samples: samples)
 
@@ -174,14 +176,17 @@ fn pub tests(t: mut Tests) {
       # The first update.
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
+      750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
 
       # The second update, where we'll maintain the speed for a while.
       650, 650, 650, 650, 650, 650, 650, 650, 650, 650,
       650, 650, 650, 650, 650, 650, 650, 650, 650, 650,
+      650, 650, 650, 650, 650, 650, 650, 650, 650, 650,
 
       # The third update, where we'll reduce the speed.
       550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
       550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
+      550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
     ]
 
     let input = input(state, samples: samples)
@@ -201,14 +206,17 @@ fn pub tests(t: mut Tests) {
       # The first update.
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
+      750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
 
       # The second update.
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
+      700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
 
       # The third update.
       550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
       550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
+      550, 550, 550, 550, 550, 550, 550, 550, 550, 550,
     ]
 
     let input = input(state, samples: samples)
@@ -229,10 +237,12 @@ fn pub tests(t: mut Tests) {
       # The first update.
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
+      700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
 
       # The second update.
       600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
       600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+      600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
     ]
 
     let input = input(state, samples: samples)
@@ -250,14 +260,17 @@ fn pub tests(t: mut Tests) {
       # The first update.
       900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
       900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
+      900, 900, 900, 900, 900, 900, 900, 900, 900, 900,
 
       # The second update.
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
       700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
+      700, 700, 700, 700, 700, 700, 700, 700, 700, 700,
 
       # The third update.
       500, 500, 500, 500, 500, 500, 500, 500, 500, 500,
       500, 500, 500, 500, 500, 500, 500, 500, 500, 500,
+      500, 500, 500, 500, 500, 500, 500, 500, 500, 500,
     ]
 
     let input = input(state, samples: samples)
@@ -278,10 +291,12 @@ fn pub tests(t: mut Tests) {
       # Update 1
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
       750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
+      750, 750, 750, 750, 750, 750, 750, 750, 750, 750,
 
       # Update 2
       675, 675, 675, 675, 675, 675, 675, 675, 675, 675,
       675, 675, 675, 675, 675, 675, 675, 675, 675, 675,
+      675, 675, 675, 675, 675, 675, 675, 675, 675, 675,
     ]
 
     let input = input(state, samples: samples)