Raising a dweller's happiness

Question

This is related to How can I increase my Vault Dweller's Happiness?, but slightly different.

I know what can raise a dweller's happiness, but what I want to know is what can raise it by how much?

For example, being a healthy, unaffected dweller with no job keeps a dweller's happiness at 50%. Then on the other hand, breeding raises it up to 100%. However I have noticed that there are fairly definitive "levels" throughout the vault. Generally at 100%, 90-80%, 75%, and 50%.

I know what can lower a dweller's happiness, and I know that breeding is a guaranteed boost to 100%, but I can't always afford to have a Vault full of pregnant women.

So, to clarify my question - What Vault features raise a dweller's happiness; and to what level?

Answer 1

Happiness can be positively affected by several things, primarily (but not restricted to):

• Mating. This will automatically raise a dweller's happiness to 100%.
• Successfully rushing a room. Raises happiness by 10%
• Healing a dweller. This will raise a dweller's happiness back to their original happiness. I.e. if a dweller's happiness was at 50%, they then took damage/radiation poisoning, which lowered their happiness, they will return to 50%^{[citation needed]}
• The Radio Room*. This automatically raises vault-wide happiness.
• Bottle and Cappy*. The Nuka-Cola mascots occasionally visit your vault (if you have completed the "Nabbed from Nuka-World" event) and raise vault-wide happiness for a short time.

Happiness can also be affected negatively in several ways as well, including:

• Dying. This can severely affect dweller happiness, often causing it to drop to minimal levels
• Failing a rush. Unsuccessfully rushing a room can cause dwellers to lose 10% happiness.
• Getting sick/injured. Taking large amounts of damage or radiation poisoning can cause dweller happiness to drop.
• Not enough food/water. If the vault supply stores drop below the minimum requirements, vault-wide happiness will be reduced. This may also be applicable to losing power.
• Dead bodies. If a dweller has died in a room, all other dwellers in that room will lose significant levels of happiness. (May affect vault-wide happiness).

*Sources needed for how much these affect happiness.

Answer 2

Playing on PC. I had one male dweller with happiness at 10%. After breeding his happiness was 72% - and increase of 62%. I didn't check his happiness immediately after breeding; I checked it after I sent him back to his assignment. This time lapse may account for the extra 2%. My guess is the actual increase was 60% in this case.